JP2008181595A - Disc medium recording / reproducing apparatus, multi-stream read program, and multi-stream read method - Google Patents

Abstract

A method for reading a disk medium capable of ensuring a transfer rate of a certain level or higher during multi-streaming processing is provided.
The first stream data and the second data are obtained from a first disk medium in which logical block addresses are allocated from the outer peripheral side to the inner peripheral side of the disk medium and a second disk medium allocated in the opposite direction. When reading two stream data of the stream data, the logical block address of the first stream data is positioned on the outer peripheral side of the first disk medium, and the logical block address of the second stream data is positioned on the outer peripheral side of the second disk medium. When reading, the first stream data is read from the first disk medium, and the second stream data is read from the second disk medium.
[Selection] Figure 1

Description

  The present invention relates to a disk medium recording / reproducing apparatus for recording / reproducing continuous stream data such as video and audio on different disk media, a multi-stream reading program for reading stream data from different disk media, and a multi-stream reading method. .

  Conventionally, in the edit processing of continuous stream data (video data, etc.) such as video and audio, the stream data recorded on different disk media is reproduced, and the scene is clipped while checking the contents of the video, So-called multi-streaming processing is generally performed. Further, as a disk medium recording / reproducing apparatus for recording / reproducing stream data with a plurality of disk media, an apparatus using a RAID (Redundant Arrays of Inexpensive Disks) method is known (see Non-Patent Document 1).

  Here, referring to FIGS. 13 to 15, a method for writing (recording) data on a disk medium using a conventional RAID (RAID 0, RAID 1, RAID 1.5) technique, and reading (reproduction) from the disk medium. ) Explain the outline of the method. FIG. 13 is an explanatory diagram for explaining a RAID0 recording / reproducing technique called “striping”. FIG. 14 is an explanatory diagram for explaining a RAID1 recording / reproducing technique called “mirroring”. FIG. 15 is an explanatory diagram for explaining a RAID 1.5 technique in which RAID 0 and RAID 1 are integrated.

As shown in FIG. 13, RAID 0 includes stream data in the first disk D ₁ that is one disk medium for recording stream data such as video and audio, and the second disk D ₂ that is the other disk medium. Are recorded in a distributed manner. That, RAID0, a plurality of logical regions to the first disk _{D 1} (data block) A-1, A-3 , A-5, ..., with A-n-1 are provided, the plurality to the second disk _{D 2} , A-n are provided in the logical areas A-2, A-4, A-6,.
Data writing (recording) in RAID 0 is performed by writing the stream data in a distributed manner in these logical areas A-1, A-2, A-3, ..., An. Data reading (reproduction) in RAID 0 is performed by switching the disk medium for each logical area (data block) and reading the stream data recorded on the first disk D ₁ and the second disk D _2. .

RAID 0 has a feature that writing and reading can be performed at high speed because writing and reading are performed in a distributed manner in units of blocks. However, RAID0 is stream data to be distributed recorded on the first disk D ₁ and second disk D _2, no redundancy, fault tolerance and reliability have the disadvantage of low.

Further, as shown in FIG. 14, RAID1 is the first disk D ₁ and second disk D _2, are configured to record the same stream data to parallel. That, RAID1, the first plurality of logical regions A-1 to the disk _{D 1} and second disk _{D 2, A-2, A} -3, ..., and A-n are provided respectively, the two sets of logic Data is recorded in parallel in the areas A-1, A-2, A-3,..., An.
Data reading (reproduction) in RAID 1 is performed by reading data from either the first disk D _{1 or} the second disk D ₂ .

This RAID 1 has the characteristics that redundancy is achieved by duplication of data storage and reliability is increased because stream data is recorded in parallel on the two first disks D ₁ and second disks D ₂ . In addition to having the disadvantage that the storage capacity is doubled, the data is read serially, so that the reading speed is slower than that of RAID0.

Further, as shown in FIG. 15, RAID 1.5 is configured to record stream data in parallel on the first disk D ₁ and the second disk D ₂ in the same manner as RAID 1 described above. That, RAID1.5 a first plurality of logical regions A-1 to the disk _{D 1} and second disk _{D 2, A-2, A} -3, ..., and A-n are provided respectively, the two pairs Are recorded in parallel in the logical areas A-1, A-2, A-3,. Data reading (reproduction) in RAID 1.5 is performed by switching the disk medium for each logical area (data block) and reading out (reproducing) stream data in the same manner as in RAID0.

RAID 1.5, like RAID 1 (mirroring), records stream data in parallel on the two first disks D ₁ and D ₂ , so that redundancy is achieved by duplication of stream data storage and reliability. It has the feature that the property increases. In addition, RAID 1.5 reads the stream data recorded on the first disk D ₁ and the second disk D ₂ by switching the disk medium for each logical area (data block), similarly to the RAID 0 (striping). Therefore, pipeline processing is possible, and the read speed can be increased.

  In addition to the above RAID0, RAID1, and RAID1.5, there are RAID3, RAID4, RAID5, and RAID6 methods using three or more disk media, but these increase the writing / reading speed. However, it has the disadvantages that the disk capacity on the system increases and the cost increases, and that it takes much time to recover when a failure occurs.

Conventionally, a ZCAV (Zone Constant Angular Velocity) method is often used as a recording / reproducing method for a disk medium, and in order to keep the angular velocity of the disk medium constant, Then, the data transfer rate is different. Generally, there is a speed difference of approximately double in transfer performance between the outer peripheral side and the inner peripheral side.
Therefore, using the same stream data, the disk medium in which the stream data is written from the inner circumference side and the disk medium in which the stream data is written from the outer circumference side, the desired stream data is read from the disk medium on the outer circumference side. A technique for improving transfer performance by reading stream data is disclosed (see, for example, Patent Document 1).
Free encyclopedia “Wikipedia”, [online], search January 15, 2007, Internet <URL: http://en.wikipedia.org/wiki/RAID> JP 2002-74847 A

However, when a general RAID system is used, there is a problem that the transfer speed at the time of reading stream data varies due to the difference between the inner circumference and the outer circumference.
Thus, for example, in editing stream data (video data), the stream data is written on different disk media using RAID 1 or RAID 1.5, and the editor edits while simultaneously referring to the two stream data. If one stream data is recorded on the inner circumference side of the disk medium and the other stream data is recorded on the outer circumference side of the disk medium, the transfer speed of the stream data recorded on the outer circumference side is recorded. On the other hand, the transfer speed for reading the stream data recorded on the inner circumference side may not be able to catch up, and when the stream data is played back, flickering will occur on the editing screen, causing problems in editing There is.

  In addition, when stream data is written to different disk media from the outer peripheral side and the inner peripheral side in order to improve transfer performance, two different stream data are recorded on the outer peripheral side of one disk medium. Sometimes. In this case, when the editor tries to edit the two different stream data, the two stream data cannot be read out simultaneously from one disk medium, so one of the stream data is recorded on the inner circumference side. Must be read from disk media. Even in this case, the transfer speed for reading the stream data recorded on the inner circumference side may not catch up with the transfer speed of the stream data recorded on the outer circumference side of the disk medium. When the stream data is played back, there is a problem that flickering occurs on the editing screen and the editing work is hindered.

  The present invention has been made in view of the above-described problems. When a stream data is read from a disk medium and played back, the disk medium can be recorded and played back at a constant transfer speed. An apparatus, a multi-stream reading program, and a multi-stream reading method are provided.

  The present invention was devised to achieve the above object. First, the disc medium recording / reproducing apparatus according to claim 1 applies the same stream data to the first and second disc media, respectively. A disk medium recording / reproducing apparatus that records a plurality of data and reads and reproduces first and second read data, which are stream data to be read, from different disk media of the first or second disk media, respectively, Means, determination means, reading means, and switching means.

  In such a configuration, the disk medium recording / reproducing apparatus writes the stream data to the first disk medium with the logical block address assigned from the outer peripheral side to the inner peripheral side of the first disk medium by the writing unit, The stream data is written to the second disk medium with a logical block address assigned from the inner circumference side to the outer circumference side of the disk medium. As a result, the same stream data is written on one disk medium from the outer peripheral side and written on the other disk medium from the inner peripheral side.

  Then, the disk medium recording / reproducing apparatus determines the read position of each read data in the first disk medium and the second disk medium based on the respective logical block addresses of the first and second read data by the determining means. . This makes it possible to determine whether the stream data is written on the outer peripheral side or the inner peripheral side of the disk medium.

  Then, the disk medium recording / reproducing apparatus has the reading position on the first disk medium and the second disk medium determined by the determining means by the reading means from the disk media positioned on the outer peripheral side of the respective disk media. Read second read data. Thus, by reading data from the outer peripheral side, the transfer speed can be increased.

  Further, the disk medium recording / reproducing apparatus is configured such that when the first and second read data are both positioned on the outer peripheral side of one of the first and second disk media by the switching unit, The reading source of the second read data is switched between the first disk medium and the second disk medium. As a result, even when the stream data to be read is both written on the outer periphery side of the same disk medium, the first disk medium and the second disk medium are switched for each of the first and second read data. As a result, the stream data is read out at a substantially uniform transfer rate.

  The multi-stream read program according to claim 2 includes a first disk medium on which a plurality of stream data is recorded with a logical block address assigned from the outer peripheral side to the inner peripheral side, and the inner peripheral side to the outer peripheral side. To read two stream data of the first read data and the second read data from the second disk medium in which the same stream data as the first disk medium is recorded with the logical block address assigned toward The computer is configured to function as determination means, reading means, and switching means.

  In such a configuration, the multi-stream read program determines the read position of the read data on the first disk medium and the second disk medium based on the logical block addresses of the first and second read data by the determination unit. To do. Then, the multi-stream reading program reads the first and second disk media from the disk media whose read positions on the first disk medium and the second disk medium determined by the determination unit are located on the outer peripheral side of the respective disk media. 2 Read the read data. In addition, the multi-stream read program causes the first and second read data in the read means when the first and second read data are both located on the outer peripheral side of one of the first and second disk media. 2. Read source of read data is switched between the first disk medium and the second disk medium.

  Furthermore, the multi-stream reading method according to claim 3 includes a first disk medium on which a plurality of stream data is recorded with logical block addresses assigned from the outer peripheral side to the inner peripheral side, and from the inner peripheral side to the outer peripheral side. Multi-stream read for reading out two stream data of the first read data and the second read data from the second disk medium in which the same stream data as the first disk medium is recorded with the logical block address assigned toward The method includes a determination step and a reading step, and in the reading step, the first and second read data are both transferred to the outer peripheral side of one of the first and second disk media by the switching means. If it is located, the first and second read data are read from the first disk medium. And wherein the switching between the second disk medium.

  In this procedure, the multi-stream reading method is configured such that, in the determining step, the determining means determines the first disk medium and the second disk of the read data based on the logical block addresses of the first and second read data. The reading position on the medium is determined.

In the multi-stream reading method, in the reading step, the reading position in the first disk medium and the second disk medium determined by the determining means is read from the disk medium located on the outer peripheral side of each disk medium in the reading step. Read the first and second read data.
At this time, in the reading step, when both the first and second read data are located on the outer peripheral side of one of the first and second disk media by the switching unit, the first and second data in the reading unit are displayed. The reading source of the read data is switched between the first disk medium and the second disk medium.

The present invention has the following excellent effects.
According to the present invention, the logical block address of the first read (stream) data is located on the outer peripheral side of the first disk medium, and the logical block address of the second read (stream) data is located on the outer peripheral side of the second disk medium. In this case, since the stream data is read from the outer peripheral side of the disk medium, a high transfer rate can be ensured. As a result, the flickering on the editing screen due to the difference in transfer speed in the video data editing process is eliminated, and the multi-streaming process can be performed smoothly.

  Further, when the read logical block address of the first read data is located on the outer peripheral side of the first disk medium and the logical block address of the second read data is located on the inner peripheral side of the second disk medium, or the first When the read logical block address of the stream data is located on the inner circumference side of the first disk medium and the logical block address of the second stream data is located on the outer circumference side of the second disk medium, the first disk medium is provided at predetermined intervals. Since the two stream data are read by switching between the second disk medium and the second disk medium, the transfer speed of the two stream data is at least a certain transfer speed near the midpoint between the outer peripheral edge and the inner peripheral edge of the disk medium. Is done. As a result, the flickering on the editing screen due to the difference in transfer speed in the video data editing process is eliminated, and the multi-streaming process can be performed smoothly.

[Functional configuration of disk medium recording / reproducing apparatus]
Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a functional block diagram of a disk medium recording / reproducing apparatus S according to an embodiment of the present invention. FIG. 1 is a block diagram of a hardware configuration of the present invention and functions of a central processing unit (CPU) 1 of FIG. It is shown with attention.

The disk medium recording / reproducing apparatus S includes a first hard disk drive HDD ₁ (hereinafter simply referred to as “HDD ₁ ”) and a second hard disk drive HDD ₂ (hereinafter simply referred to as “HDD ₂ ”). A hard disk drive is provided. These _HDD 1, HDD _2, described in detail later, the HDD _1, together with a hard disk _{D 1} corresponding to the first disk medium is provided, in the HDD ₂ corresponds to the second disk medium hard D ₂ is provided. These hard disks D ₁ and D ₂ are written with continuous stream data such as video and audio under the control of the CPU ₁ , and the written stream data is read from these hard disks D ₁ and D _2. It is configured to be

  The CPU 1 is in charge of the control operation of reading the two stream data of the first read data and the second read data according to the multi-stream read method of the present invention, and the writing means according to the disk medium recording / reproducing apparatus of the present invention, the determination Means, reading means and switching means. Here, the CPU 1 includes a write control unit 1a, a logical block allocation unit 1b, a first read block detection unit 1c, a second read block detection unit 1d, a first position determination unit 1e, and a second position determination. The unit 1f, the switching control unit 1g, and the switching unit 1h are configured to function.

The write control unit (writing means) 1a writes stream data for writing such as continuous video data such as video and audio on the hard disks D ₁ and D ₂ allocated by the logical block allocation unit 1b. is there.

Logical block allocation unit (write unit) 1b, to the hard disk D _1, performs assignment of a logical block address by the first formatting process, the hard disk D _2, allocation of the logical block address by the second formatting process Is to do.
The first formatting process is a process of assigning logical block address (logical block address) in ascending order toward the inner peripheral side from the outer side of the hard disk D _1. The second formatting process is a process of assigning logical block addresses in ascending order from the inner circumferential side of the hard disk D ₂ to the outer peripheral side. These write control unit 1a and logical block allocation unit 1b constitute a writing means according to the present invention.

First read block detection section (reading means) 1c is for reading stream data corresponding to the logical block address output from the first position determining unit 1e to be described later (the first read data) from the hard disk D _1.

Second read block detection section (reading means) 1d is for reading stream data corresponding to the logical block address output from the second position determining unit 1f to be described later (second read data) from the hard disk D _2. The first read block detection unit 1c and the second read block detection unit 1d constitute a reading unit according to the present invention.

The first position determination unit (determination means) 1e determines in which location of the hard disk D ₁ the logical block address of the stream data (first read data) that has been input from the outside and requested to be read is determined. Is. The first position determining portion 1e on the basis of the logical block address, the read position is determined whether the inner circumferential side or an outer peripheral side of the hard disk D _1, and outputs the determination result to the switching control section 1g .

Second position determining section (determining means) 1f is a logical block address of the stream data for which the read request (second read data), is to determine whether located on the hard disk D ₂ throat location. The second position determining section 1f, based on the logical block address, the read position is determined whether the inner circumferential side or an outer peripheral side of the hard disk D _2, and outputs the determination result to the switching control section 1g . The first position determination unit 1e and the second position determination unit 1f constitute a determination unit according to the present invention.

Switching control section (switching means) 1 g, based on the first position determining portion 1e and a second position determination of the position of the logical block address determined in 1f determination result, the source reads the hard disk D ₁ and the hard disk D ₂ Is to switch.
Here, when both the determination results of the positions of the logical block addresses determined by the first position determination unit 1e and the second position determination unit 1f are on the outer peripheral side, the switching control unit 1g does not perform switching and reads as it is. Continue. Further, when the result is the inner circumferential side both, the switching control unit 1g, to the first position determining unit 1e, reads out the second read data from the hard disk D ₁ through the first read block detector 1c performs instruction of fact, the second position determining unit 1f, performs an instruction to read the first read data from the hard disk D ₂ through the second read block detection unit 1d. This results in none of the hard disk D ₁ and the hard disk D ₂ read out data on the outer circumference side.

When the determination result of the position of the logical block address is one on the outer peripheral side and the other is on the inner peripheral side, the two stream data are recorded on the outer peripheral side of the same hard disk D ₁ (or hard disk D ₂ ). Will be. Therefore, in this case, the switching control unit 1g is a two stream data, each alternately switching between read source in the hard disc D ₁ and the hard disk D _2. As a result, there is no state where any one of the stream data is read from only the inner circumference side, so that the transfer rates of the two stream data can be made uniform.
When switching the reading source, the switching control unit 1g notifies the switching unit 1h of an instruction to switch the stream data input source (the first position determination unit 1e or the second position determination unit 1f). .

The switching unit 1h switches the stream data input source to the first position determination unit 1e or the second position determination unit 1f based on a switching instruction from the switching control unit 1g. For example, when the switching control unit 1g is instructed to switch at the stage where the first stream data (first read data) is input from the first position determination unit 1e, the switching unit 1h sets the reading source to the second position. It switches to the determination part 1f. As a result, the switching unit 1h can generate and output two stream data with substantially uniform transfer rates.
Note that the writing process and the reading process will be described in detail later with reference to flowcharts.

[Hardware configuration of disk medium recording / reproducing apparatus]
Next, the hardware configuration of the disk medium recording / reproducing apparatus S will be described with reference to FIG. FIG. 2 is a block diagram showing a hardware configuration of a disk medium recording / reproducing apparatus according to an embodiment of the present invention. As described above, the CPU 1 of the disk medium recording / reproducing apparatus S controls the disk medium recording / reproducing apparatus S as a whole and performs the read control operation of the two stream data according to the present invention. Takes the means. The CPU 1 is configured to be able to edit stream data stored in the memory 4 to be described later.

In FIG. 2, reference numeral 2 denotes a bus line to which the CPU 1 is connected. The two HDD ₁ and HDD _{2 described above} are connected to the bus line 2 through the interface 3. The bus line 2 has a memory 4 for storing system program data and working data as described later, a console 5 that is an input / output provided with a display, a keyboard, a mouse, and the like, and an interface 6. An external medium 7 composed of an external device such as a video camera that is detachably connected is connected.

As shown in FIG. 3, the memory 4 is provided with a plurality of storage areas 4a to 4d. Among these, the storage area 4a is used as a video data editing work area when video data is temporarily stored during editing of predetermined stream data (hereinafter, “stream data” will be described as “video data”). . In the storage area 4b, video data for recording the video data from the external medium 7 on the HDD ₁ and HDD ₂ (hard disks D ₁ and D ₂ ), and editing the recorded video data and writing it to the external medium 7 is recorded. An editing processing program is stored.

The storage area 4c stores a multi-stream processing program (multi-stream read program) that is called from the editing process program stored in the storage area 4b and accesses the HDD ₁ and HDD ₂ . The multi-stream processing programs, a hard disk _D 1, _{D 2} first formatting process, the function of the second format processing, writes the video data to the hard disk _D 1, _{D 2,} storage from the hard disk _D 1, _{D 2} region A processing function for reading video data to the video data editing work area 4a is included. The storage area 4d stores control programs such as an OS (Operating System Program) and a driver program.

Similarly to the well-known HDD, HDD ₁ and HDD ₂ are a hard disk (D ₁ , D ₂ ) made of a magnetic disk or the like in a casing having a predetermined volume, and although not shown, an actuator, a spindle motor, A device such as a head for reading and writing data is incorporated.

[Control operation of disk medium recording / reproducing apparatus]
The control operation of the disk medium recording / reproducing apparatus S will be described below with reference to FIG. 4 (refer to FIG. 1 as appropriate). 4, the first format processing to the hard disk D _1, D ₂ which is performed before writing the video data to the hard disk D _1, D _2, the operation of the second formatting process (first initialization process, the second initialization process) It is an example of the flowchart which shows.

That is, as shown in FIG. 4 (a), CPU 1 is, with respect to HDD _1, the formatting parameters drives allocation direction of the logical block address to the hard disk _{D 1} is toward the outer side of the hard disk _{D 1} Are set in ascending order (see arrow a in FIG. 6 described later) (step S100), and an initialization command is issued (step S102). Then, initialization processing for logical block address assignment is executed in the HDD ₁ (step S104).

On the other hand, as shown in FIG. 4 (b), FIG CPU1 is to HDD _2, the ascending (later described toward the outer peripheral side from the inner peripheral side of the assignment direction hard _{D 2} of the logical block address to the hard disk _{D 2} The initialization process is executed so as to be (see arrow b in FIG. 6). Steps S100 ′ to S104 ′ in FIG. 4B are the same as the operations described with reference to FIG. 4A, except that the logical block address allocation direction is different.

(Write processing operation)
Next, referring to FIG. 5 (refer to FIG. 1 as appropriate), a writing process for writing video data to the hard disks D ₁ and D ₂ will be described. FIG. 5 is an example of a flowchart showing an operation of a writing process for writing video data to two hard disks. In this writing process, video data captured from the external medium 7 via the interface 6 is written in parallel to the hard disks D ₁ and D ₂ in accordance with the logical block address assignment described above.

That is, the write control unit 1a searches for an empty area from the logical addresses of the hard disks D ₁ and D ₂ and the data amount of the video data (step S200). Then, if there is a free area (Yes in step S202), the write control unit 1a, compared HDD _1, the writing of video data and command toward the outer side of the hard disk _{D 1} (step S204) The HDD ₂ is instructed to write the same video data from the inner circumference side to the outer circumference side of the hard disk D ₂ (step S206). Then, the writing process ends when all the video data has been written (transferred) (Yes in step S208).

  In the above-described writing process, no retry is performed in an area where a writing error has occurred during writing of data, or writing is abandoned when writing is not performed even after a predetermined finite number of times of writing, and the data to be written is discarded. Then, predetermined data indicating that the writing has failed is recorded and the writing process is performed. As a result, even if a write error occurs, the write process is continued.

In order to continue this write process, in addition to the above, when a write error occurs, the data to be written is discarded and predetermined data indicating that the write has failed is recorded, and the data is written to another area. The writing process may be continued. Further, this writing process does not refer to the access time attribute of the file with respect to the hard disk together with the reading process described later. Thus, even when the hard disks D ₁ and D _{2 in} which the video data are written are repaired or duplicated in another system, the recording / reproducing apparatus S can perform recording / reproduction. .

(Read processing operation: single stream data)
Next, with reference to FIGS. 6 and 7 (refer to FIG. 1 as appropriate), read processing for reading one stream data (single stream data) from the hard disks D ₁ and D ₂ will be described. FIG. 6 is an explanatory diagram for explaining an overview of a single stream data read process. FIG. 7 is an example of a flowchart of a read process for reading single stream data from two hard disks. This reading process is performed by utilizing the fact that video data is written in the hard disks D ₁ and D ₂ in accordance with the logical block address assignment shown by arrows a and b in FIG.

That is, in this reading process, the first position determining unit 1e determines whether it is located in the first half or the second half of the logical block address of the stream data to be read (step S300). Incidentally, if the logical block address of the first half, the stream data is written in the outer periphery of the hard disk D _1, if the logical block address is the second half, the stream data is written in the outer periphery of the hard disk D _2.

Therefore, when the logical block address is the first half (step S300 (first half)), the first position determination unit 1e selects the reading source as HDD ₁ (hard disk D ₁ ) (step S301), and the first position determination unit 1e Then, a command for reading a specified amount of data from a specified address to the memory 4 is output to the HDD ₁ via the first read block detection unit 1c (step S304). The processing is continued until the reading is completed (steps S306 and S308).
On the other hand, when the logical block address is the second half (step S300 (second half)), the switching control unit 1g switches the control from the first position determination unit 1e to the second position determination unit 1f. That is, HDD ₂ (hard disk D ₂ ) is selected as a reading source (step S302).

Although omitted in the flowchart of FIG. 7, in the reading of the first half and the second half, when one logical block address straddles an intermediate point (intermediate between the outer peripheral end and the inner peripheral end), Processing is performed as follows. For example, part of one logical block address (including the transfer specified amount) located on the first half side closer to the outer periphery of the hard disk D _1, the remainder in the second half portion side close to the inner circumferential side of the hard disk D ₁ when located divides the amount transferred to two and subsequent to the intermediate point, was subjected to identification information to an intermediate point (a flag) read from the hard disk D _1, identifying rest that is attached that read from the hard disk D ₂ using the information. Note that reading when one logical block address crosses an intermediate point is performed in the same manner in the flowchart of FIG. 9 to be described later.

As described above, when reading a single stream, a head (not shown) of each HDD ₁ , HDD ₂ is not less than an intermediate point between the outer peripheral end and the inner peripheral end of each hard disk D ₁ , D ₂ (the hard disk D ₁ , D ₂ Therefore, it is possible to always ensure a transfer rate of a certain level or more. Thus, the video data editing process can be performed smoothly.

(Read processing operation: multi-stream data)
Next, multi-stream processing for reading two stream data will be described with reference to FIGS. 8 and 9 (see FIG. 1 as appropriate). FIG. 8 shows two stream data of first stream data (hereinafter described as “stream (1)”) and second stream data (hereinafter described as “stream (2)”) from two hard disks. It is explanatory drawing for demonstrating the multi-stream process which reads out. FIG. 9 is an example of a flowchart showing the operation of multi-stream processing.

In other words, in this read process, the first position determination unit 1e uses the hard disk for the position of the logical block address of the stream (1), and the second position determination unit 1f uses the hard disk for the position of the logical block address of the stream (2). It is determined whether it is on the outer periphery side of D ₁ or hard disk D ₂ (the logical block address is the first half).
The switching control unit 1g sets the logical block address of the stream (1) to the first half based on the determination result of the position of the logical block address determined by the first position determination unit 1e and the second position determination unit 1f (step S400). (Refer to arrow a in FIG. 8) and the logical block address of stream (2) is the second half (see step S401 (second half), arrow b in FIG. 8). The reading source of ₁ ) is selected as HDD ₁ (hard disk D ₁ ), and the second position determination unit 1f selects the reading source of stream (2) as HDD ₂ (hard disk D ₂ ) (step S404).

On the other hand, when the logical block address of the stream (1) is the second half (step S400 (second half)) and the logical block address of the stream (2) is the first half (step S402 (first half)), the first position determination unit 1e The reading source of (2) is selected as HDD ₁ (hard disk D ₁ ), and the second position determination unit 1f selects the reading source of stream (1) as HDD ₂ (hard disk D ₂ ) (step S405).

Then, the first position determination unit 1e outputs a command for reading the specified amount of data from the specified address to the memory 4 to the HDD ₁ via the first read block detection unit 1c, and the second position determination unit 1f. However, through the second read block detector 1d, a command to read a specified amount of data from the specified address to the memory 4 is output to the HDD ₂ (step S406). The processing is continued until the reading is completed (steps S408 and S410).

In this multi-stream reading, similarly to the above-described single-stream reading processing, the heads (not shown) of the HDD ₁ and HDD ₂ are moved from the intermediate point between the outer peripheral edge and the inner peripheral edge of the hard disks D ₁ and D _2. Can be positioned on the outer peripheral side (outside the position of 1/2 of the radius of the hard disks D ₁ and D ₂ ), so that a transfer rate of a certain level or more can always be ensured and the two HDD ₁ , Since the HDD ₂ can operate in parallel, the performance of RAID 0 or higher can be ensured. Therefore, the video data editing process can be performed smoothly.

When the logical block address of stream (1) is the first half (step S400 (first half)) and the logical block address of stream (2) is the first half (step S401 (first half)), stream (1) and stream (2) but both the outer peripheral side of the hard disk D ₁ (arrow c in FIG. 8), will have been recorded on the inner peripheral side of the hard disk D ₂ (arrow d in FIG. 8).

When the logical block address of stream (1) is the second half (step S400 (second half)) and the logical block address of stream (2) is the second half (step S402 (second half)), stream (1) and stream (2) Are recorded on the inner peripheral side of the hard disk D ₁ (arrow e in FIG. 8) and on the outer peripheral side of the hard disk D ₂ (arrow f in FIG. 8).

In this case, when the stream (1) and the stream (2) are read from the fixed hard disk, a difference occurs in the transfer time because the read time of the stream recorded on the inner peripheral side is slow. Therefore, when the logical block addresses of the stream (1) and the stream (2) are both in the first half or both in the second half, the hard disks D ₁ and D ₂ are set at predetermined intervals, for example, every 100 ms. Switch to read.
Hereinafter, an operation of switching the hard disks D ₁ and D ₂ to perform reading in multi-stream reading will be described with reference to FIG. 10 (refer to FIG. 1 as appropriate). FIG. 10 is an example of a flowchart showing a read switching operation in multi-stream processing.

As shown in FIG. 10, in the disk medium recording / reproducing apparatus S, the switching control unit 1g sets a time (driver switching timer) for switching the reading of the hard disks D ₁ and D ₂ (step S500). The driver switching timer is, for example, 100 ms (milliseconds), and is a hardware interrupt timer.

Then, as shown in steps S502 to S508 in FIG. 10, as a normal operation, HDD ₁ (hard disk D ₁ ) is selected as the read source of one stream (1), and HDD is read as the read source of the other stream (2). ₂ (Hard Disk D ₂ ) is selected, and the stream is read out in parallel by the same operation as described in FIG.
Here, when a timer interrupt is generated by the driver switching timer, the operations of steps S600 to S610 are executed as interrupt processing.

That is, when a timer interrupt occurs, the switching control unit 1g issues a read interruption command to the HDD ₁ and HDD ₂ (step S600). Then, when the reading interruption of HDD ₁ and HDD ₂ is completed (Yes in step S602), the first reading block detection unit 1c and the second reading block detection unit 1d specify the addresses at the time of interruption, for example, the memory 4 Evacuate to. Then, the switching control unit 1g calculates the remaining read amount (designated remaining amount) of the stream (1) and the stream (2) (step S604).

If the designated remaining amount still exists (Yes in step S606), the first position determination unit 1e and the second position determination unit 1f select the currently selected read source HDD as the other HDD. This is corrected (step S608). Then, the first read block detection unit 1c and the second read block detection unit 1d switch and set (reset) the addresses saved in step S604 (step S610). Thereafter, the disk medium recording / reproducing apparatus S executes the operations after step S504.
On the other hand, if the designated remaining amount does not exist in step S606 (No in step S606), the disk medium recording / reproducing apparatus S transitions to step S510, turns off the timer (driver switching timer), and ends the operation.

As a result, when the logical block addresses of the stream (1) and the stream (2) are both in the first half, or both in the second half, the read-out HDD is periodically switched, so that the inner circumference of the hard disk can be changed. Video data can be read without biasing to the side. Accordingly, it is possible to secure a transfer speed near the intermediate point between the outer peripheral end and the inner peripheral end of the hard disk (a position that is half the radius of the hard disks D ₁ and D ₂ ). Therefore, the video data editing process can be performed smoothly.

  Here, with reference to FIGS. 11 and 12, the switching timing of two HDDs in multi-stream processing will be described. FIG. 11 is an example of a time chart when a stream is read out by switching from two hard disks in multi-stream processing. FIG. 12 is an explanatory diagram for explaining a transfer time when a stream is read from the hard disk. In FIG. 11, the horizontal axis represents time, and the vertical axis represents the transfer amount of each stream.

As shown in FIG. 11, stream (1) from the outer peripheral side of the hard disk _{D 1,} by reading the stream (2) from the inner circumferential side of the hard disk _{D 2,} the transfer of the stream (1) (HDD ₁ transfer amount) However, it becomes larger than the transfer amount of the stream (2) (HDD ₁ transfer amount). Further, when the stream (1) is read from the inner peripheral side of the hard disk D ₁ and the stream (2) is read from the outer peripheral side of the hard disk D ₂ , the stream (1) is more than the transfer amount (HDD ₁ transfer amount) of the stream (1). The transfer amount of 2) (HDD ₁ transfer amount) is larger.

Therefore, the transfer performance of the stream (1) and the stream (2) can be averaged by switching the HDD to be read.
In this case, when switching between the _two HDD ₁ and HDD ₂ for reading, as shown in FIG. 12, a loss of waiting time (L) associated with seek time (T ₁ ) and rotation waiting time (T ₂ ) occurs. . The average transfer performance of the streams (1) and (2) considering this loss can be obtained by the following equation.

Average transfer performance of streams (1) and (2) = ( _first half transfer amount of HDD ₁ + _second half transfer amount of HDD ₂ ) / (drive switching cycle + seek time) ≈intermediate transfer amount of HDD ₁ and HDD ₂ * 2 // Drive switching cycle + seek time)

Therefore, for example, if the data transfer time (T ₀ ) is 100 ms and the waiting time (drive switching period + seek time (= L)) is 10 ms, the transfer rate near the midpoint of the hard disk is reduced by 10%. Can do. Thus, since the transfer rate near the midpoint of the hard disk can be maintained, there is no practical problem.

  The present invention is not limited to the above-described embodiment, and can be modified without departing from the spirit of the present invention. For example, a flexible disk can be used instead of a hard disk, or an optical disk can be used. Also, although the stream data is video data, it can be other types of stream data such as audio-only data.

It is a functional block diagram of the disc medium recording / reproducing apparatus concerning one Embodiment of this invention. It is a block diagram which shows the hardware constitutions of the disk medium recording / reproducing apparatus which concerns on one Embodiment of this invention. It is a block diagram of the program data stored in the memory of the disk medium recording / reproducing apparatus concerning one Embodiment of this invention. It is an example of the flowchart which shows the operation | movement of the initialization process of a disk. It is an example of the flowchart which shows the operation | movement of the write-in process of the stream data to a disc. It is explanatory drawing for demonstrating the outline | summary of the read-out process which reads stream data from a disc. It is an example of the flowchart which shows the operation | movement of the reading process of a single stream. It is explanatory drawing for demonstrating multistream processing. It is an example of the flowchart which shows the operation | movement of a multi-stream read-out process. It is an example of the flowchart which shows the switching operation | movement of reading in multistream processing. It is an example of a time chart when switching from two hard disks and reading a stream in multi-stream processing. It is explanatory drawing for demonstrating the transfer time at the time of reading a stream from a hard disk. It is explanatory drawing for demonstrating the method of the conventional RAID0. It is explanatory drawing for demonstrating the method of the conventional RAID1. It is explanatory drawing for demonstrating the method of the conventional RAID1.5.

Explanation of symbols

S disk medium recording / reproducing apparatus HDD ₁ first hard disk drive HDD ₂ second hard disk drive D ₁ hard disk D ₂ hard disk 1 central processing unit (CPU)
DESCRIPTION OF SYMBOLS 1a Write control part 1b Logical block allocation part 1c 1st read block detection part (reading means)
1d Second read block detector (reading means)
1e 1st position determination part (determination means)
1f 2nd position determination part (determination means)
1g Switching control unit (switching means)
1h switching unit 2 bus line 3 interface 4 memory 4a to 4d storage area 5 console 6 interface 7 external medium

Claims (3)

A plurality of the same stream data is recorded on each of the first and second disk media, and the first and second read data, which are stream data to be read, are recorded on different disks of the first and second disk media, respectively. A disk medium recording / reproducing apparatus that reads out and reproduces from a medium,
The stream data is written to the first disk medium with a logical block address assigned from the outer circumference side to the inner circumference side of the first disk medium, and from the inner circumference side to the outer circumference side of the second disk medium. Writing means for writing the stream data to the second disk medium with the assigned logical block address;
Determining means for determining the read position of each read data in the first disk medium and the second disk medium based on the respective logical block addresses of the first and second read data;
Read means for reading out the first and second read data from the disk medium located on the outer circumference side of the respective disk medium, the read positions on the first disk medium and the second disk medium determined by the determining means;
When the first and second read data are both located on the outer peripheral side of one of the first and second disk media, a reading source of the first and second read data in the reading unit is Switching means for switching between the first disk medium and the second disk medium;
A disk medium recording / reproducing apparatus comprising: A first disk medium on which a plurality of stream data is recorded with logical block addresses assigned from the outer peripheral side toward the inner peripheral side, and the first disk with logical block addresses assigned from the inner peripheral side toward the outer peripheral side. In order to read the two stream data of the first read data and the second read data from the second disk medium on which the same stream data as the medium is recorded,
Determining means for determining a read position of each read data in the first disk medium and the second disk medium based on the respective logical block addresses of the first and second read data;
Read means for reading the first and second read data from the disk medium whose read positions on the first disk medium and the second disk medium determined by the determination means are located on the outer peripheral side of the respective disk media,
When the first and second read data are both located on the outer peripheral side of one of the first and second disk media, a reading source of the first and second read data in the reading unit is Switching means for switching between the first disk medium and the second disk medium;
A multi-stream read program characterized by being caused to function as A first disk medium on which a plurality of stream data is recorded with logical block addresses assigned from the outer peripheral side toward the inner peripheral side, and the first disk with logical block addresses assigned from the inner peripheral side toward the outer peripheral side. A multi-stream read method for reading two stream data of a first read data and a second read data from a second disk medium on which the same stream data as the medium is recorded,
A determination step of determining a read position of each read data in the first disk medium and the second disk medium based on the logical block addresses of the first and second read data by a determination unit;
Reading by the reading means for reading the first and second read data from the disk medium whose read positions on the first disk medium and the second disk medium determined by the determination means are located on the outer circumference side of each disk medium. Including steps,
In the reading step, when both the first and second read data are located on the outer peripheral side of one of the first and second disk media by the switching unit, the first and second read data in the reading unit are displayed. A multi-stream read method, wherein a read source of second read data is switched between the first disk medium and the second disk medium.

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