CN1979646B - Reading method for multi-layer recording medium - Google Patents

Abstract

A multi-layer recording medium and a method for reading the multi-layer recording medium, the multi-layer recording medium at least includes: a first recording layer and a second recording layer stacked on the first recording layer; the method for reading the multilayer recording medium of the present invention at least comprises: firstly recording the final physical block address (EPSA) of the first user area in the lead-in area, secondly, when the CD-ROM is to read the data of the CD, firstly reading the final physical block address of the first user area in the lead-in area, secondly, reading the data in the first user area, and judging whether the data is located at the final physical block address of the first user area, and finally, jumping to the second recording layer when the judgment result is yes; the invention is suitable for the recording medium with a plurality of recording layers, increases the data storage space, provides a simple conversion formula between the logical block address and the physical block address, improves the reading speed of the recording medium data and saves the reading time.

Description

Reading method of multi-layer recording medium

technical field

The invention relates to a recording medium and a method for reading the recording medium, in particular to a recording medium applied in a multi-layer structure and a method for reading the recording medium.

Background technique

A single-layer recording medium must have a certain recording capacity, but often because the capacity of audio-visual or digital data is too large, so that a single-layer recording medium cannot completely record the entire data, it must be divided into more than two layers of recording media to record the entire data, so The whole data will be cut into more than two parts and recorded in each recording layer respectively. With the continuous progress and development of information technology, optical discs used as recording media are also required to have more recording capacity. Dual layer (dual layer) DVD disc is a product that meets the demand for high recording capacity. Two information recording layers increase the recording capacity of the DVD disc from 4.7GB of the original single-layer DVD disc to 8.5GB.

Figure 1A shows the principle of reading data from a dual recording layer (recording layer) optical disc. As shown in the figure, a plurality of pits (Pit) and land surfaces (Land) with different lengths are formed at appropriate positions on the transparent substrate. , and coat a half reflective layer or a reflective layer on the pits and land surfaces of each layer to form the first recording layer L1 and the second recording layer L2, between the first recording layer L1 and the second recording layer L2 There is a space layer (space layer) L3 with an appropriate thickness to avoid signal interference between the first recording layer L1 and the second recording layer L2, and its embodiment is a photoplastic resin (Transparent photosetting Resin; TR) , and by adjusting the thickness of the reflective layer, the first recording layer L1 can allow partial light reflection, and the second recording layer L2 can allow all light reflection. When the player plays the optical disc, the laser beam ( Laser Beam) focuses on the first recording layer L1 and the second recording layer L2 respectively, so that the recorded data on the first recording layer L1 and the second recording layer L2 can be read.

It should be noted that data will be recorded in the smallest recording unit "physical block", distributed in each recording layer, and each physical block will be marked with a value, which is called "physical block address". When the recording medium has two or more recording layers, two factors must be considered when distributing the physical block address: one, each physical block address on the entire recording medium must be unique (except In addition to the tracking path method of PTP (Parallel Track Path), if the same physical block address exists in the first recording layer and the second recording layer, the optical disc playback device cannot judge only based on its physical block address Whether the desired information is recorded on the first recording layer L1 or the second recording layer L2. Its two, the physical block address assigned to each recording layer needs to be easily converted to any address on the first recording layer. To move to the desired block accurately and quickly, the precise distance to be moved must be calculated from the physical block address.

Most of the dual-layer optical discs currently on the market use the Opposite TrackPath (OTP) tracking path method, as shown in Figure 1B, this method first uses the optical pickup head to lead in Zone from the inner circle of the Layer 0 recording layer. Start to read data, and read along the Data Zone to the Middle Zone located in the outer circle, that is, jump directly to the Layer 1 recording layer, and start reading data from the Middle Zone located in the outer circle until it moves to the Middle Zone located in the inner circle. until the lead-out zone of the circle. Since the optical reading head can directly read the data of the next recording layer without adjusting to the innermost circle after reading all the data of a recording layer, it can save the time for the optical reading head to search for the data of the lower layer. This method is generally implemented.

U.S. Patent No. 5881032 patent case "Optical Disk, And Optical Disk Reproduction Method And Apparatus Implementing a Mathematical Complementary Relationship For Plural Layers" proposes a position encoding rule for recording media, wherein the recording media includes multiple recording layers, the odd layer Contrary to the reproduction directions of the spiral grooves on the even layer (as shown in Figure 2A), the physical block addresses assigned to the odd layer and the even layer at the same radius position are complementary value.

As shown in Figure 2B again, it is a schematic diagram of the address allocation of a recording medium including a double-layer recording layer in the above-mentioned patent. In the figure, the first layer L1 physical block address (Physical Sector Address) on the same radius position r X and the physical block address X' of the second layer L2 are in a complementary relationship. For example, if the physical block address of the first layer L1 located on the radius r is 030000h, then the physical block address on the same radius position in the second layer must be FCFFFFh (wherein, h represents hexadecimal counting method). As shown in the figure, the shaded area 1a and the shaded area 1b are a lead-in area and a middle area respectively, and the blank area between the lead-in area 1a and the middle area 1b is a user information area, The physical block address of the inner radius of the first layer user area is Xin, the physical block address of the outer radius is Xout (wherein, Xin<Xout), the physical block address of the first layer L1 is determined by the inner Increment from the circle to the outer circle, and take the complement of the physical block address of the first layer L1 located at the same radius (R) as the physical block address of the corresponding second layer L2, therefore, each of the second layer L2 The physical block addresses increase sequentially from the outer ring to the inner ring. In addition, the final physical block address of the first layer L1 and the initial physical block address of the second layer L2 are not consecutive in value.

As shown in FIG. 2C again, it is a schematic diagram of address assignment of a recording medium comprising four recording layers. As shown in the figure, in order to make the physical block addresses of the third layer L3 and the fourth layer L4 differ in the first For the physical block address of layer L1 and second layer L2, a character (byte) needs to be added to the physical block address. Assuming that the physical block address of the third layer L3 is 0130000h, according to the physical block address only The last 3Bytes adopts the principle of complementarity, and it can be calculated that the address of the physical block on the same radius on the fourth layer L4 is 01CFFFFh.

The address coding rules disclosed in the above-mentioned patents are characterized in that the physical block addresses of the first recording layer and the second recording layer corresponding to the approximate address in the radial direction of the DVD disc are in a complementary relationship, so this address coding method only Applicable to the data structure of double-layer DVD discs, the expansion of the encoding rule is poor, and it is not universal. If the address encoding method is applied to DVD discs with more than three layers, additional Byte records must be added. This will undoubtedly reduce the storage space of DVD discs. If calculated based on DVD disc specifications, the storage space of recordable data in each recording layer will be reduced by about 2.4 MBytes. In addition, in a DVD disc with a diameter of 12 cm, the area between the radius of 24 mm and 58 mm is the data recording area. If the address encoding is performed according to the address encoding rule, only 030000h is used in the wide area that can be recorded in 3 Bytes. ～2930E9h and D6CF16h～FCFFFFh are two extremely small configuration addresses, and the larger configurable addresses in the middle (2930E9h～D6CF16h) will not be used at all, wasting too many configurable storage addresses (as shown in Figure 2D); Furthermore, the access locations of video and audio data in general optical discs are organized by logical block positions in the file system. Therefore, when an optical drive accesses data on a DVD disc, the logical block address and physical block address must be determined. Conversion action, according to the general rules in the industry, the data recording area of a general DVD disc starts with the physical block address 030000h, and the logical block address starts with 000000h, so when the optical drive reads the physical block address When uploading data, it needs to be converted with the logical block address in advance. The conversion formula disclosed in this patent is in accordance with the coding rules of its complementary method:

When PSA is in the first layer, (LSA)=(PSA)-(Xin)

When PSA is on the second layer, (LSA)=(PSA)+[2*(Xout)+2]-(Xin)

However, the above-mentioned conversion algorithm between LSA and PSA is only applicable to double-layer DVD discs in a complementary manner. Therefore, this conversion algorithm cannot be applied to optical discs with more than three layers in this patent, because the extra 1Byte is not suitable for complementary methods.

Based on the above, how to provide a data structure suitable for multiple record layers and effectively utilize configurable addresses is an urgent problem to be solved.

Contents of the invention

In order to overcome the above-mentioned shortcomings of the prior art, the main purpose of the present invention is to provide a multi-layer recording medium and a reading method for the multi-layer recording medium, which are suitable for recording media with multiple recording layers.

Another object of the present invention is to provide a multi-layer recording medium and a method for reading the multi-layer recording medium, which fully utilizes configurable storage addresses and increases data storage space.

Another object of the present invention is to provide a multi-layer recording medium and a method for reading data from the multi-layer recording medium, provide a simple conversion formula between the logical block address and the physical block address, and be applicable to multiple recording layers recording media.

Another object of the present invention is to provide a multi-layer recording medium and a reading method of the multi-layer recording medium, which improves the reading speed of recording medium data and saves reading time.

In order to achieve the above and other related purposes, the present invention provides a multi-layer recording medium and a method for reading the multi-layer recording medium, the multi-layer recording medium at least includes: a first recording layer (Recording Layer), with at least a lead-in area (Guide-In Region), a first user area (User Region) continuous with the final physical block address of the lead-in area and a first jump layer area (User Region) continuous with the final physical block address of the first user area ( Jump Region); and a second recording layer stacked on the first recording layer, at least having a second layer jump area, a second user area continuous with the final physical block address of the second layer jump area, and a The lead-out area (Guide-Out Region) continuous with the final physical block address of the second user area; the lead-in area, the first layer jump area, the second layer jump area and the lead-out area of the first recording layer and the second recording layer There are a fixed number of physical blocks in the area, and the final physical block address of the first layer jump area is continuous with the initial physical block address of the second layer jump area, that is, it is connected between the two recording layers The physical block addresses are continuous. In addition, the lead-in area records the initial physical block address (SURPSA) of the first user area, the initial physical block address (SGIPSA) of the lead-in area, the final physical area of the first user area and the second user area Block address (EPSA) and the number of physical blocks in the first layer jump area, the second layer jump area and the lead-out area.

The present invention also relates to a multi-layer recording medium, which comprises: a first recording layer, at least having a lead-in area, a first user area continuous with the final physical block address of the lead-in area, and a The first layer jump area where the final physical block address of the first user area is continuous; at least one intermediate recording layer stacked on the first recording layer has at least one outer jump layer area, and one final layer jump area with the outer jump layer area A user area with continuous physical block addresses and an inner layer jump area continuous with the final physical block address of the user area; and a second recording layer stacked on the intermediate recording layer, at least having a second layer jump area, A second user area continuous with the final physical block address of the second layer jump area and a lead-out area continuous with the final physical block address of the second user area; wherein, the first recording layer, the intermediate recording layer The physical blocks of the lead-in area, the first layer jump area, the outer layer jump area, the inner layer jump area, the second layer jump area and the lead-out area of the second recording layer are respectively a fixed number, and the first layer jump area The final physical block address of the jump layer area is continuous with the starting physical block address of the outer jump layer area, and the final physical block address of the inner jump layer area is continuous with the starting physical block address of the second layer jump layer area That is, the physical block addresses connected between the recording layers (the first recording layer, the intermediate recording layer and the second recording layer) are continuous. In addition, the lead-in area records the initial physical block address of the first user area, the initial physical block address of the lead-in area, the final physical block addresses of the first user area, the user area, and the second user area, And the number of physical blocks in the first layer jump area, the outer layer jump area, the inner layer jump area, the second layer jump area and the lead-out area.

The method for reading a multi-layer recording medium is applicable to having at least one first recording layer and a second recording layer stacked on the first recording layer, and is characterized in that the first recording layer has at least one lead-in area, one A first user area continuous with the final physical block address of the lead-in area and storing user data and a first skip layer area continuous with the final physical block address of the first user area, the second recording layer has at least A second layer jump area, a second user area continuous with the final physical block address of the second layer jump area and storing user data, and a lead-out area continuous with the final physical block address of the second user area , wherein, the final physical block address of the first layer jump area and the initial physical block address of the second layer jump area are continuous values, and the method for reading at least includes: (1) recording the starting physical block address of the lead-in area The initial physical block address, the initial physical block address of the first user area, the final physical block address of the first user area and the second user area, and the first layer jump area, the second layer jump area and The number of physical blocks in the lead-out area is in the lead-in area; (2) the optical pick-up head pre-reads the final physical block address of the first user area in the lead-in area, the final physical block address of the second user area , and the number of physical blocks in the first layer jump area and the second layer jump area; (3) make the optical pick-up head move to the initial physical block address of the first user area, and send to the first user Read data in the direction of the final physical block address of the zone, read the current physical block address, and judge whether it has been located in the final physical block address of the first user area, if so, then proceed to step (4), If not, then repeat this step; and (4) the optical pick-up head jumps to the second recording layer, reads the current physical block address of the second recording layer, according to the final physical area greater than the first user area The sum of the block address and the number of physical blocks in the first layer jump area is used to judge that the optical pick-up head is located in the second recording layer, and the final physical area in the second recording layer and the second layer jump area is calculated The starting physical address of the second user area with continuous block addresses, read the user data continuously, and at the same time, when the current physical block position is equal to or greater than the final physical block position of the second user area, the reading ends Pick.

In the prior art shown in FIG. 2B to FIG. 2C, "the physical block addresses between different layers are configured in a complementary manner, so the addresses are discontinuous", that is, the physical block address at the end of the first recording layer, and the physical block address at the end of the first recording layer. The starting physical block addresses of the second recording layer are discontinuous.

Compared with the prior art, the multi-layer recording medium and the reading method of the multi-layer recording medium of the present invention are suitable for recording media with multiple recording layers, and make full use of the configurable storage space, increase the data storage space, and also Provides a simple conversion method between the logical block address and the physical block address, and can analyze the storage location of the media data to be read according to the relevant address information recorded in the lead-in area, and improve the readability of the media data. Accelerate reading speed and save reading time.

Description of drawings

FIG. 1A is a schematic diagram of an optical disc with two recording layers realizing information reproduction;

FIG. 1B is a schematic diagram of a position encoding method of an OTP tracking path adopted by a general double-layer optical disc;

Fig. 2A is a schematic diagram of the shape of spiral grooves of two recording layers in the prior art;

FIG. 2B is a schematic diagram of an address allocation method for a recording medium including two recording layers in the prior art;

FIG. 2C is a schematic diagram of address assignment of a recording medium including four recording layers in the prior art;

FIG. 2D is a schematic diagram of the complementary relationship of physical block addresses of each layer in the prior art;

3A is a schematic diagram of Embodiment 1 of the recording medium data structure of the present invention;

3B is a schematic diagram of embodiment 2 of the recording medium data structure of the present invention;

Fig. 4 is a schematic diagram of the operation flow for judging the current layer number of the optical pickup head according to the physical block address;

Fig. 5 is a schematic diagram of the operation flow for judging whether the optical pickup head needs to jump layers by using the calculation method of Fig. 4;

FIG. 6A is a schematic flow diagram of converting a physical block address into a logical block address; and

FIG. 6B is a schematic flow chart of converting logical block addresses into physical block addresses.

Detailed ways

The multilayer recording medium of the present invention is an optical disc having at least two recording layers. Generally, in the process of manufacturing multi-layer optical discs in the industry, films or substrates with various layers of signals are reprinted, stacked or pasted on the substrate. Due to factors such as tolerances, the edges on both sides of each recording layer in a multi-layer optical disc cannot be completely aligned, that is, a "position error" occurs. In the no-data area, the rail cannot be locked correctly and the computer crashes. In order to avoid the occurrence of the above-mentioned abnormal situation, the current existing technology is to set up a protection area at the front and rear ends of the user area of each recording layer, and store relevant information such as the address of the physical block and the name of the area in the protection area, so that the optical After the read head jumps the layer, it can immediately read the corresponding physical block address according to the locked address point, so as to perform tracking operation. The main technical feature of the present invention is that the protected areas on both sides of the recording layer are a section of physical blocks with a fixed and reasonable number (please describe in detail later).

In this embodiment, the protected area can be defined as a Guide-in Region, an Inside Jump Region, an OutsideJump Region or a Lead-in Region ( Guide-out Region), play a different role. Wherein, the lead-in area is set in the first recording layer start address section of the optical disc with multiple recording layers, generally located in the inner circle of the multi-layer optical disc, and records a plurality of related information for the optical drive to interpret; the lead-in area (Guide -out Region) is set at the end section of the last recording layer in the multi-layer optical disc. If the optical disc of the multi-layer recording layer is an even layer, the lead-out area is located in the inner circle of the optical disc. If the optical disc of the multi-layer recording layer is Odd-numbered layers, the lead-out area is located at the outer ring of the disc; the InsideJump Region is set at the inner ring of each recording layer except the first recording layer (if the inner ring of the last recording layer has a lead-out area Then there is no such inner jump layer region), the outer jump layer region (Outside JumpRegion) is arranged on the outer ring of each recording layer (if the outer ring of the last recording layer has a lead-out area, there is no outer jump layer region).

Example 1

As shown in FIG. 3A, it is a schematic diagram of Embodiment 1 of the multi-layer recording medium of the present invention, and the direction of the arrow indicates the sequence when reading data. As shown in the figure, the multi-layer recording medium includes a first recording layer (Recording Layer) 31 and a second recording layer 32 stacked on the first recording layer 31. On the first recording layer 31, there are a guide-in region (Guide-In Region) 311, a first user region (User Region) 312 and a first jump layer region (Jump Region) 313, and the guide-in region 311, the first The physical block addresses (Physical Sector Address; PSA) of a user area 312 and the first layer jump area 313 are continuous; on the second recording layer 32, there are a second layer jump area 321 and a second user area 322 And a guide-out region 323, and the physical block addresses of the second layer jump region 321, the second user region 322 and the lead-out region 323 are continuous. Wherein, the final physical block address of the first layer jumping area 313 and the starting physical block address of the second layer jumping area 321 continuously increase or decrease continuously. The physical blocks (Physical Sector) of the lead-in area 311, the first layer-skip area 313, the second layer-skip area 321, and the lead-out area 323 are respectively a fixed and reasonable number, and the lead-in area 311, the first layer-skip area 313, The number of physical blocks corresponding to the second layer jump area 321 and the lead-out area 323 may be the same or different. In this embodiment, according to the specification defined by the DVD disc, the error of each recording layer stack should not be greater than 0.5 mm, and it is calculated based on the track pitch of 0.74 μm, which can span approximately 676 tracks. Calculate, about the physical block of quantity 48000, therefore, the preferred embodiment of the fixed number of physical blocks of this first jump layer area 313 and the second layer jump area 321 can be set as the physical block of quantity 50000 However, this fixed number of physical blocks is only a preferred implementation manner, and this number does not limit the implementation of the fixed number of physical blocks in the present invention. In addition, the start physical block address (SGIPSA) of the lead-in area 311, the start physical block address (SURPSA) of the first user area 312, the final physical block address (SURPSA) of the first user area 312 are recorded in the lead-in area 311. The block address (EPSA1), the final physical block address (EPSA2) of the second user area 322 and the number of physical blocks in the first layer jump area 313 , the second layer jump area 321 , and the lead-out area 323 .

Example 2

Please refer to FIG. 3B , which is a schematic diagram of Embodiment 2 of the multi-layer recording medium of the present invention, and the direction of the arrows indicates the sequence of reading data. The multi-layer recording medium includes a first recording layer 31 , at least one intermediate recording layer 33 stacked on the first recording layer 31 and a second recording layer 32 stacked on the intermediate recording layer 33 . On the first recording layer 31, there are a lead-in area 311, a first user area 312 and a first layer jump area 313, the physical blocks of the lead-in area 311, the first user area 312 and the first layer jump area 313 Addresses are continuous; on this intermediate recording layer 33, there are an outer layer jump area 331, a user area 332 and an inner layer jump area 333, the physical The block addresses are continuous; on the second recording layer 32 there is a second layer jump area 321, a second user area 322 and a lead-out area 323, the second layer jump area 321, the second user area 322 and The physical block addresses of the lead-out area 323 are continuous. Wherein, the final physical block address of the first recording layer 31 (that is, the final physical block address of the first layer jump area 313) and the initial physical block address of the intermediate recording layer 33 (that is, the outer jump The initial physical block address of the layer area 331) is continuously incremented or continuously decreased; The starting physical block address of the layer 32 (that is, the starting physical block address of the second layer jump area 321 ) is also continuously incremented or continuously decremented. The physical blocks of the lead-in area 311, the first layer-hopping area 313, the outer layer-hopping area 331, the inner layer-hopping area 333, the second layer-hopping area 321 and the lead-out area 323 are respectively a fixed and reasonable number, and the lead-in area 311 The number of physical blocks corresponding to the first layer jump area 313 , the outer layer jump area 331 , the inner layer jump area 333 , the second layer jump area 321 and the lead-out area 323 may be the same or different. In addition, the start physical block address of the lead-in area 311, the start physical block address of the first user area 312 are recorded in the lead-in area 311, the first user area 312, the user area 332 and the second user area The final physical block address of the area 322 , the number of physical blocks in the first layer jump area 313 , the outer layer jump area 331 , the inner layer jump area 333 , the second layer jump area 321 and the lead-out area 323 .

In this embodiment, all data in the multi-layer recording medium is read by an optical pickup head (not shown) of an optical drive. The reading method of this multi-layer recording medium comprises:

(1) Record the initial physical block address of the lead-in area 311, the initial physical block address of the first user area 312, the final physical block addresses of the first user area 312 and the second user area 322, and the The number of physical blocks in the first layer jump area 313, the second layer jump area 321, and the lead-out area 323 is in the lead-in area 311;

(2) When the optical drive is to read the multi-layer recording medium, the optical pick-up head is first locked in the range of the lead-in area 311, and reads the initial physical block address of the lead-in area 311 recorded in the lead-in area 311 , the starting physical block address of the first user area 312, the final physical block addresses of the first user area 312 and the second user area 322, and the first layer jump area 313, the second layer jump area 321, The number of physical blocks in the lead-out area 323 .

(3) Compare the initial physical block address of the read first user area 312 with the physical block address currently locked by the optical pickup head, judge the moving direction of the optical pickup head, and make the optical pickup head Move the head to the initial physical block address of the first user area 312, and read data from the initial physical block address to the final physical block address in the first user area 312, and compare repeatedly The physical block address of the current position of the optical pick-up head and the final physical block address of the first user area 312 read by the lead-in area before, until the comparison result is equal or greater, then proceed to step (4);

(4) when it is judged that the current reading position of the optical pickup head is the final physical block position located in the first user area 312, immediately execute the layer jump command to jump into the second recording layer 32, and Interpret the physical block address located at this time, and then calculate the initial physical address of the second user area 322 of the second recording layer 32 according to the final physical block address of the first user 312 area, and then use the The calculated starting physical address of the second user area 322 is compared with the position of the currently located physical block read out, so that the optical pick-up head is moved to the starting physical address of the second user area 322, continuously Read the user data, and repeatedly compare whether the current physical block position is equal to or greater than the final physical block position of the second user area 322, and when the judgment result is equal or greater, it means the end of the process. times of data read process.

The following describes the operation process of judging the current position of the optical pickup head according to the position of the physical block, and determining whether the optical pickup head needs to jump layers, and the conversion method flow of the logical block address and the physical block address in conjunction with FIG. 3B. For the purpose of simplifying the description, in the present embodiment, the number of physical blocks in the lead-in area 311, the inner layer jump area 333 and the second layer jump area 321 of the recording medium are equal, so the number of physical blocks [(G1) =(the starting physical block address SURPSA of the first user area 312)-(the starting physical block address SGIPSA of the lead-in area 311)]; the first jump layer area 313, the outer jump layer area 331 and the lead-out area 323 have the same number of physical blocks, assuming that they are all (G2) physical blocks, and G2 may be equal to or not equal to G1.

As shown in FIG. 4 , it is a schematic diagram of the operation flow for judging the current position of the optical pickup head according to the physical block address. As shown in the figure, first perform step S410, read the starting physical block address (hereinafter referred to as SGIPSA) of the lead-in area 311 in the lead-in area 311, the starting physical block address (hereinafter referred to as SGIPSA) of the first user area 312 ( hereinafter referred to as SURPSA), the final physical block address of the first user area 312 (hereinafter referred to as EPSA1), the final physical block address of the user area 332 (hereinafter referred to as EPSA2), and the first jump layer area 313 Physical block quantity (hereinafter referred to as G2 for short), and calculate the physical block quantity (hereinafter referred to as G1) of this lead-in area 311, wherein, (G1)=(SURPSA)-(SGIPSA), obtain inner jump layer 333 The number of physical blocks is G1, then proceed to step S420.

In the step S420, the current physical block address (hereinafter referred to as X) is read, and then step S430 is performed.

In the step S430, it is judged whether X is greater than (G2)+(EPSA1), if not, it is judged that the optical pick-up head is located in the first recording layer 31 (such as step S460), otherwise, go to step S440.

In the step S440, it is judged whether X is greater than (G1)+(EPSA2), if not, it is judged that the optical pickup head is located in the middle recording layer 33 (such as step S470), otherwise, go to step S450.

In the step S450 , it is determined that the optical pickup head is located on the second recording layer 32 .

As shown in Figure 5, a schematic diagram of the operation flow for judging whether the optical reading head needs to jump layer by using the judgment rule in Figure 4, that is, when the user needs to read a certain piece of data, the optical reading head is provided to judge whether In the method of quickly reading data by jumping layers, first perform step S510 to read the current physical block address (hereinafter referred to as X), and then perform step S520.

In the step S520, identify the target physical block address (hereinafter referred to as Y), where Y is the physical block address of a certain segment of data that the user wants to read, and then proceed to step S530.

In the step S530, according to the above-mentioned judgment rule (as shown in FIG. 4 ), the recording layer where X is located (hereinafter referred to as L1 ) is judged, and then step S540 is performed.

In the step S540, according to the above-mentioned judgment rule (as shown in FIG. 4 ), the recording layer where Y is located (hereinafter referred to as L2 for short) is judged, and then step S550 is performed.

In this step S550, it is judged whether L1 is equal to L2, if yes, proceed to step S560, if not, proceed to step S570.

In the step S560, L1 is equal to L2, indicating that the current address and the identification address are located in the same recording layer, and the optical pickup head does not need to jump layers.

In the step S570, L1 is not equal to L2, so that the optical pickup head jumps to the recording layer L2 to continue reading data.

As shown in FIG. 6A , it is a schematic flow chart of converting physical block addresses into logical block addresses. Please cooperate with that shown in Figure 3B at the same time, the number of physical blocks in the lead-in area 311, the inner layer jump area 333 and the second layer jump area 321 is the same, the number of physical blocks in the first user area 312 and the middle layer user area 332 is the same, and the number of physical blocks in the first user area 312 and the middle layer user area 332 is the same. The number of physical blocks in the first layer jump area 313 , the outer layer jump area 331 and the second layer jump area 323 is the same. First, step S610 is performed to read the initial physical block address of the lead-in area 311 (hereinafter referred to as SGIPSA), the initial physical block address of the first user area 312 (hereinafter referred to as SURPSA), the The final physical block address (hereinafter referred to as EPSA1) of the first user area 312, and the physical block quantity (hereinafter referred to as G2) of the first jump layer area 313 and the outer jump layer area 331, and calculate the lead-in area 311 , the number of physical blocks (hereinafter referred to as G1) of the inner layer jump area 333 and the second layer jump area 321, the number of physical blocks (hereinafter referred to as Y) of the first user area 312 and the middle layer user area 332, wherein , (G1)=(SURPSA)-(SGIPSA); (Y)=(EPSA1)-(SURPSA)+(1), then go to step S620.

In the step S620, read the physical block address (hereinafter referred to as X) in the recording medium to be converted, and then proceed to the step S630.

In this step S630, the difference between X and SURPSA (hereinafter abbreviated as W) is calculated, and then the process proceeds to step S640.

In the step S640, it is judged whether W is smaller than Y, if yes, proceed to step S651, and obtain that the logical block address (hereinafter referred to as LSA) is equal to W, if not, proceed to step S650.

In this step S650, the count value (hereinafter referred to as Count for short) is set to 0, and then step S660 is performed.

In this step S660, it is judged whether the Count is divisible by 2, if yes, proceed to step S671, otherwise proceed to step S672.

In this step S671, calculate the formula (W)=(W)-(Y)-(2)×(G2), and then proceed to step S680.

In this step S672, calculate the formula (W)=(W)-(Y)-(2)×(G1), and then proceed to step S680.

In this step S680, calculate (Count)=(Count)+(1), and then proceed to step S690.

In this step S690, it is judged whether W is smaller than Y, if not, proceed to step S660, if yes, proceed to step S691.

In this step S691, the LSA is calculated, and the calculation formula is (LSA)=(Count)×(Y)+(W).

6B is a schematic flow chart of converting the logical block address into a physical block address. Firstly, step S710 is performed to read the starting physical block address of the lead-in area 311 of the lead-in area 311 (hereinafter referred to as SGIPSA), the first user The starting physical block address (hereinafter referred to as SURPSA) of the area 312, the final physical block address (hereinafter referred to as EPSA1) of the first user area 312, and the address of the first layer jump area 313 and the outer layer layer area 331 The number of physical blocks (hereinafter referred to as G2), and calculate the number of physical blocks (hereinafter referred to as G1) of the lead-in area 311, the inner layer jump area 333, and the second layer jump area 321, the first user area 312 and the middle The physical block quantity (hereinafter referred to as Y) of layer user area 332, wherein, (G1)=(SURPSA)-(SGIPSA); (Y)=(EPSA1)-(SURPSA)+(1), then enter step S720.

In the step S720, the logical block address to be converted (hereinafter referred to as X) is read, and then step S730 is performed.

In this step S730, the integer obtained by calculating (X)/(Y) (hereinafter referred to as Q) and the remainder obtained by (X)/(Y) (hereinafter referred to as R) is calculated, and then step S740 is performed.

In this step S740, it is judged whether (Q) is (0), if yes, go to S751, if not, go to step S750.

In the step S751, the physical block address (hereinafter referred to as PSA) is calculated, and the calculation formula is (PSA)=(SURPSA)+(R).

In this step S750, the parameter (abbreviated as i hereinafter)=(Q), the count value (abbreviated as Count hereinafter)=(0) and the parameter (abbreviated as W hereinafter)=(0) are set, and step S760 is performed.

In this step S760, it is judged whether the Count is divisible by 2, if yes, go to step S771, if not, go to step S772.

In this step S771, calculate the formula (W)=(W)+(Y)+(2)×(G2), and then proceed to step S780.

In this step S772, calculate the formula (W)=(W)+(Y)+(2)×(G1), and then proceed to step S780.

In this step S780, calculate (Count)=(Count)+(1), and then proceed to step S790.

In this step S790, calculate (i)=(i)-(1), and then proceed to step S800.

In this step S800, it is judged whether i is equal to 0, if so, proceed to step S810, otherwise return to step S760.

In the step S810, the physical block address (hereinafter referred to as PSA) is calculated, and the calculation formula is (PSA)=(W)+(SURPSA)+(R).

The flow of the method for converting physical block addresses and logical block addresses shown in FIGS. 6A and 6B above is applicable to all multi-layer recording media (including recording media with two or more layers). However, for the two-layer recording medium, because the structure is relatively simple, the layer jumping area only has the first layer jumping area and the second layer jumping area, so the conversion method can be simplified.

Please refer to FIG. 3A and FIG. 6A at the same time. The method for converting the physical block address into a logical block address first reads the starting physical block address of the lead-in area 311 (hereinafter referred to as SGIPSA), the first user The starting physical block address (hereinafter referred to as SURPSA) of the area 312, the final physical block address (hereinafter referred to as EPSA1) of the first user area 312, and the first layer jump area 313 and the second layer jump area 321 The number of physical blocks (hereinafter referred to as G2), the number of physical blocks (hereinafter referred to as Y) of the first user area 312, wherein, (Y)=(EPSA1)-(SURPSA)+(1); secondly, Read the physical block address to be converted in the recording medium (hereinafter referred to as X); again, calculate the difference between X and SURPSA (hereinafter referred to as W); finally, judge whether W is less than Y, if so, draw the logic The block address (hereinafter referred to as LSA) is equal to W, if not, it is calculated (LSA)=(W)-(2)×(G2).

Please refer to Figures 3A and 6B. The method for converting the logical block address into a physical block address is firstly to read the lead-in area 311 starting physical block address (hereinafter referred to as SGIPSA) of the lead-in area 311, the first The starting physical block address of the user area 312 (hereinafter referred to as SURPSA), the final physical block address of the first user area 312 (hereinafter referred to as EPSA1), and the first layer jump area 313, the second layer jump area 321 physical block quantity (hereinafter referred to as G2), the physical block quantity (hereinafter referred to as Y) of the first user area 312, wherein, (Y)=(EPSA1)-(SURPSA)+(1); secondly , read a logical block address to be converted (hereinafter referred to as X); again, calculate the integer (hereinafter referred to as Q) obtained by (X)/(Y), and the remainder obtained by (X)/(Y) ( Hereinafter referred to as R); finally, calculate the physical block address (PSA)=(SURPSA)+(Q)×[(Y)+(2)×(G2)]+(R).

In summary, the multi-layer recording medium and the reading method of the multi-layer recording medium of the present invention can be applied to all optical discs with more than two layers, and have a wide range of application. continuous, therefore, the present invention makes full use of configurable storage addresses, in addition, the present invention provides a simple conversion method between logical block address and physical block address, and this conversion method is applicable to multi-layer recording layer Address conversion, moreover, the present invention records the final physical block address of the user area in each recording layer in the lead-in area, so that the optical drive can directly compare with the current physical block address, and judge that the optical pickup head is currently located The recording layer can determine the recording layer where the physical block address to be read is located, quickly determine whether the optical reading head needs to jump layers, improve the reading speed of recording medium data, and save reading time.

Claims (14)

1. the read method of a multi-layer recording medium, this multi-layer recording medium has at least one first recording layer and a storehouse the second recording layer at this first recording layer, it is characterized in that, this first recording layer at least have a Lead-In Area, one and this Lead-In Area final physical block address continuously and deposit the first user district and one and the final physical block address continuous print first skip floor district in this first user district of user's data; And this second recording layer at least have one second skip floor district, one and this second skip floor district final physical block address continuously and deposit second user area and one and the final physical block address continuous print leading-out zone of this second user area of user's data, wherein, the final physical block address in this first skip floor district and the initial physical blocks address in the second skip floor district are serial numbers, and this read method at least comprises:

(1) the physical blocks quantity of the final physical block address of the initial physical block address in the initial physical block address of Lead-In Area, this first user district, this first user district and the second user area and this first skip floor district, the second skip floor district and this leading-out zone is recorded in this Lead-In Area;

(2) optical read head reads the physical blocks quantity in the final physical block address in this first user district in this Lead-In Area, the final physical block address of the second user area and this first skip floor district, the second skip floor district in advance;

(3) this optical read head is made to move to the initial physical block address in this first user district, and read data to the direction of the final physical block address in this first user district, read the physical block address at current place, and judge whether the final physical block address being positioned at this first user district, if, then enter step (4), if not, then repeat this step; And

(4) this optical read head jumps to this second recording layer, read the current physical block address of this second recording layer, according to being greater than the summation of the final physical block address in this first user district and the physical blocks quantity in this first skip floor district to judge that this optical read head is positioned at this second recording layer, calculate the start physical address with this second user area of final physical block address continuous print in this second skip floor district in this second recording layer, these user's data of continuous reading, the physical block locations be simultaneously positioned in this prior is equal or when being greater than the final physical block locations of this second user area, terminate to read.

2. the read method of multi-layer recording medium as claimed in claim 1, it is characterized in that, the physical block address of this first recording layer and the second recording layer increases progressively continuously.

3. the read method of multi-layer recording medium as claimed in claim 1, it is characterized in that, the physical block address of this first recording layer and the second recording layer successively decreases continuously.

4. the read method of multi-layer recording medium as claimed in claim 1, it is characterized in that, the second skip floor district of the Lead-In Area of this first recording layer and the first skip floor district and the second recording layer and the physical blocks of leading-out zone are a fixed qty respectively.

5. the read method of multi-layer recording medium as claimed in claim 4, is characterized in that, the physical blocks of this Lead-In Area, the first skip floor district, the second skip floor district and leading-out zone is equal number.

6. the read method of multi-layer recording medium as claimed in claim 4, is characterized in that, the physical blocks of this Lead-In Area, the first skip floor district, the second skip floor district and leading-out zone is varying number.

7. the read method of multi-layer recording medium as claimed in claim 1, is characterized in that, calculates to comprise physical block address and be scaled the computing method that the computing method of logical block addresses and logical block addresses are scaled physical block address.

8. the read method of multi-layer recording medium as claimed in claim 7, it is characterized in that, the computing method that this physical block address is scaled logical block addresses at least comprise:

A () is read initial physical block address SGIPSA, the initial physical block address SURPSA in this first user district, the final physical block address EPSA1 in this first user district of this Lead-In Area in this Lead-In Area and is supposed that identical is all the first skip floor district of G2, the physical blocks quantity in the second skip floor district, and calculate the physical blocks quantity Y in this first user district;

B () reads physical block address X to be converted in this recording medium;

C () calculates the difference W of the initial physical block address SURPSA in this physical block address X and this first user district;

D () judges whether W is less than Y, if so, show that this logical block addresses LSA equals W, if not, then enter step (e); And

E () calculates this logical block addresses LSA, its computing formula is LSA=W-2 × (G2).

9. the read method of multi-layer recording medium as claimed in claim 7, it is characterized in that, the computing method that this logical block addresses is scaled physical block address at least comprise:

A () is read initial physical block address SGIPSA, the initial physical block address SURPSA in this first user district, the final physical block address EPSA1 in this first user district of this Lead-In Area in this Lead-In Area and is supposed that identical is all the first skip floor district of G2, the physical blocks quantity in the second skip floor district, and calculate the physical blocks quantity G1 of this Lead-In Area and the physical blocks quantity Y in this first user district;

B () to read in this recording medium a logical block addresses X to be converted;

C () calculates the integer Q of X/Y gained, and the remainder R of X/Y gained; And

D () calculates this physical block address PSA, computing formula is PSA=SURPSA+Q × [Y+2 × (G2)]+R.

10. the read method of multi-layer recording medium as claimed in claim 7, it is characterized in that, this physical block address is scaled the computing method at least Bao Kuo ︰ of logical block addresses

A () reads the physical blocks quantity G2 in initial physical block address SGIPSA, the initial physical block address SURPSA in this first user district of this Lead-In Area in this Lead-In Area, the final physical block address EPSA1 in this first user district and this first skip floor district, and calculate the physical blocks quantity G1 of this Lead-In Area and the physical blocks quantity Y in this first user district;

B () reads physical block address X to be converted in this recording medium;

C () calculates the difference W of the initial physical block address SURPSA in this physical block address X and this first user district;

D () judges whether W is less than Y, if so, namely show that this logical block addresses LSA equals W, if not, then enter step (e);

E () parameters i equals the record number of plies of this recording medium data structure, and the initial value arranging count value Count is 0;

F () judges whether this count value Count can be divided exactly by 2, if so, then calculate W according to computing formula W=W-Y-2 × (G2), if not, then calculates W according to computing formula W=W-Y-2 × (G1);

G () calculates Count=Count+1, and enter step (h);

H () judges whether W is less than Y, if not, then enter step (f), if so, then enter step (i); And

I () calculates this logical block addresses LSA, its computing formula is LSA=Count × Y+W.

The read method of 11. multi-layer recording mediums as claimed in claim 7, it is characterized in that, the computing method that this logical block addresses is scaled physical block address at least comprise:

A () reads the physical blocks quantity G2 in initial physical block address SGIPSA, the initial physical block address SURPSA in this first user district of this Lead-In Area in this Lead-In Area, the final physical block address EPSA1 in this first user district and this first skip floor district, and calculate the physical blocks quantity G1 of this Lead-In Area and the physical blocks quantity Y in this first user district;

B () to read in this recording medium a logical block addresses X to be converted;

C () calculates the integer Q of X/Y gained, and the remainder R of X/Y gained;

D () parameters i equals Q, parameter W equals 0, and the initial value of count value Count is 0;

E () judges whether this count value Count can be divided exactly by 2, if so, then calculate W according to computing formula W=W+Y+2 × (G2), if not, then calculates W according to computing formula W=W+Y+2 × (G1);

F () calculates Count=Count+1 and i=i-1;

G () judges whether i equals 0, if not, then turn back to step (e), if so, then enter step (h); And

H () calculates this physical block address PSA, its computing formula is PSA=W+SURPSA+R.

The read method of 12. multi-layer recording mediums as described in claim 10 or 11, it is characterized in that, the computing formula of the physical blocks quantity G1 of this Lead-In Area is G1=SURPSA-SGIPSA.

The read method of 13. multi-layer recording mediums as described in claim 10 or 11, it is characterized in that, the computing formula of the physical blocks quantity Y in this first user district is Y=EPSA1-SURPSA+1.

The read method of 14. multi-layer recording mediums as claimed in claim 1, is characterized in that, this recording medium is two-layer above CD.

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