CN1697053A - Optical recording device and related method - Google Patents

Abstract

The invention discloses an optical recording device and a related method, which are used for recording a plurality of information units on an optical storage medium in the form of a first type pattern and a second type pattern. Wherein each information unit has a long run length sync pattern. The optical recording apparatus includes: a pickup head for outputting a laser beam to the optical storage medium to record the information units; a sync pattern selection unit for selecting the type of the long run length sync patterns of the information units. When the type of the at least one long run-length synchronization pattern is selected, if the time that the first type pattern with the run length larger than a preset length does not appear is larger than a preset threshold, the synchronization pattern selection unit selects the at least one long run-length synchronization pattern as a first type pattern.

Description

Optical recording device and related method

technical field

The invention relates to an optical recording device, especially an optical recording device capable of recording data on an optical storage medium.

Background technique

With the advent of the information and multimedia era, various electronic products have increasing demands on the storage density and capacity of storage media. Moreover, due to the circulation of a large amount of information, storage media with high storage density, miniaturization, and low production cost are more required. Optical storage media such as optical discs have become one of the most commonly used data storage media in the modern information society due to their low price, light size and weight, and the potential to store large amounts of data. In particular, the successful research and development of writable optical discs allows users to write personal data into optical discs according to their needs, making optical discs one of the most important portable personal storage media. Therefore, how to make optical disc data access more reliable and more efficient has become the focus of research and development in related industries.

When writing data to an optical disc, the pickup head in the optical recording device (that is, the optical drive) must output laser light with appropriate power to the surface of the optical disc to correctly record the data on disc. Please refer to FIG. 1 . FIG. 1 is a schematic diagram of changes in laser power output by a laser diode (LD) in an optical drive when data is written to an optical disc. For a single write disc (write once disc), the laser power output by the laser diode will vary among peak power, write power and read power; For rewritable discs, the laser power output by the laser diode will vary among write power, erase power and bias power. When writing a single "mark" pattern on the disc, the laser diode will output a single recording pulse for a single write disc; for rewritable discs, the laser diode Multiple recording pulses (multi pulse) will be output.

When writing, the servo control system (servo control system) in the optical drive must sense the state of specific signals such as focus error signal FE (focus error) and tracking error signal TE (tracking error) The writing head performs precise servo control (servocontrol). In addition, in order to prevent the power of the laser output by the laser diode from changing too much due to temperature changes, for write-once discs (such as CD-R, DVD-R), the "automatic power" in the optical drive Control" (automatic power control, APC) device must sense the read power and write power through the front photodiode output signal (front photodiode output signal, FPDO), as a reference for automatic power control; for rewritable For disks (such as CDRW, DVDRW), the automatic power control device must sense the erasing power through the FPDO as a reference for automatic power control.

The work of the aforementioned servo control and automatic power control must involve the action of sensing appropriate signals, and since the signals will change frequently as shown in Figure 1, optical drives usually use "sample-hold" (sample-hold) ) to sense the status of signals at different power levels. However, the sampling and holding method must ensure that the signal does not change too much during the sampling time, and is limited by the settling time and sampling rate of the sampling unit (sampler), as well as the writing rate of the optical drive. Usually only when writing a data pattern with a run length greater than a preset length, the optical drive can effectively sample a specific signal. For low-speed applications, the aforementioned preset length is not too large, and the general data can provide a data pattern that allows the sampling unit to perform sampling. However, for high-speed applications, the aforementioned preset length will become larger, and the general data area on the optical disc may not be able to provide data patterns with sufficient length for the sampling unit to perform sampling work. The long run length sync pattern (long run length sync pattern) in the frame sync code (frame sync code) will become particularly important.

Taking a CD-type optical disc as an example (such as CDR or CDRW), an information frame synchronization code will be included at the beginning of each information frame (frame), and two information frame synchronization codes will be included in each information frame synchronization code. A continuous 11T data pattern (ie, the aforementioned long-run-length synchronous pattern), where T is the length of each channel bit. In other words, the "mark" (mark) of 11T and the "land" (land) of 11T will appear at least once in each information frame (at least each will appear in the information frame synchronization code in each information frame once), so that the optical drive can have enough opportunities to sample a specific signal.

The situation of DVD-type discs is slightly different from that of CD-type discs. In DVD discs, there are four different recording units in total, which are "channel bit", "data frame", "data sector", and "error correction code". block" (error correction code block, ECC block). A channel bit is the smallest recording unit in an optical disc, and the unit of a channel bit can usually be represented by "T". When recording data, the optical drive will convert each byte of data into 16 channel bits through "eight to fourteen modulation plus (EFM+), and between "eight to fourteen modulation plus" In the specifications of the "modulation+" technology, the number of consecutive occurrences of channel bits with the same state is limited to between 3 and 11 times. In other words, except for the information frame synchronization code, the legal run length (legal run length) of normal data in the disc will be between 3T and 11T, and the run length less than 3T or greater than 11T is the so-called "illegal run length". Run length" (illegal run length). As for the information frame synchronization code, different from CD discs, the information frame synchronization code of DVD discs only contains a single 14T pattern (14T pattern), and this 14T pattern can only be "label" or " One of "space".

Please refer to FIG. 2. FIG. 2 is a schematic diagram of a possible data pattern of a sync code (sync code) in the specification of a DVD-type optical disc. The synchronization code at the beginning of each information box is determined by the next state (next state) corresponding to the ending codeword of the previous information box. There are two different options, namely "main synchronization Code" (primary sync code) and "secondary sync code" (secondary sync code).

Since when recording data on an optical disc, it is generally desirable to have as few low frequency components as possible (it can also be said to hope that the DC component is as small as possible), so the optical drive will continue to accumulate when recording each channel bit. The so-called "digital sum value" (digital sum value, DSV), whenever a bit "1" is recorded, the DSV is added by 1; when the bit is "0", the DSV is subtracted by 1. And the optical drive must control the absolute value of DSV as small as possible. Therefore, whenever the synchronization code is to be recorded on the optical disc, the optical drive will select a pattern (which may be the primary synchronization code or the secondary synchronization code) that can make the absolute value of the DSV have a smaller value as the synchronization code. As shown in Figure 2, the end of each synchronization code will contain the same 22-bit data pattern "0001000000000000010001". After non return to zero inversion (NRZI), the 22-bit same data pattern "100000000000000" will form 14 channel bits with the same signal state, which can usually be called "14T pattern" (that is, the aforementioned long-run-length synchronous pattern). For any primary synchronization code, the 14T pattern contained in it will have the opposite category to the 14T pattern contained in the corresponding secondary synchronization code, that is: when the primary synchronization code is selected, if the 14T pattern will correspond to "Mark", when the secondary synchronization code is selected, the 14T pattern will correspond to "space"; when the main synchronization code is selected, if the 14T pattern will correspond to "space", then when the secondary synchronization code is selected, the 14T pattern will be will correspond to "label". As mentioned above, whenever the optical drive wants to record the sync code on the optical disc, it will select the pattern (which can be the primary sync code or the secondary sync code) that can make the absolute value of DSV have a smaller value as the sync code.

In addition to using the principle of "digital sum minimization" (DSV minimization) to determine the category of "14T style", the patent case of US Patent Early Publication Case No. 2003/0053389 also provides another different approach, which is In each multiple (for example, every two) message boxes, one long-running-length synchronous pattern is fixedly set as the "mark" pattern, and the rest of the long-running-length synchronous patterns can be fixed as the "space" pattern, or according to The principle of minimizing the sum of numbers mentioned above is used to set it as a "label" style or a "space" style.

This method is mainly applicable to optical disc drives using "dynamic optimal power control" (running optimal power control, ROPC). Because the demand for sampling the 14T mark in the application of dynamic optimal power control will be greater than that in the application of automatic power control. However, this approach does not take into account that in high-speed applications, the sampling requirements for 14T space format samples will also become larger. And because the practice of this early public case is to fix a long-run length synchronous pattern as "label" in each multiple information frames, there is no way to suitably set each 14T according to the sampling requirements of each time point. The style was chosen as the most appropriate kind, so it cannot be regarded as the most ideal solution.

Contents of the invention

In view of this, an object of the present invention is to provide an optical recording device and a related method that can more flexibly select the type of each long run-length sync pattern when writing data.

The optical recording device disclosed in the present invention is used to record a plurality of information units on an optical storage medium in the form of a first type pattern and a second type pattern, wherein each information unit includes a long run length synchronous According to the pattern, the optical recording device includes: a read-write head for outputting a laser light to the optical storage medium to record the information units; and a synchronous pattern selection unit for selecting the long run length of the information units Types of synchronous patterns, wherein, when selecting at least one type of long-running-length synchronous patterns, if the first type of pattern with a run length greater than a predetermined length does not appear for a time greater than a predetermined threshold, the synchronous pattern selection unit is The at least one long run length sync pattern is selected as a first class pattern.

In addition, the method disclosed in the present invention can be used in an optical recording device, the optical recording device includes a read-write head, and the read-write head is used to convert a plurality of information units into a first type and a second type The form of the pattern is recorded on an optical storage medium, wherein each information unit includes a long run length synchronous pattern, the method includes the following steps: calculating the time when the first category pattern whose run length is greater than a predetermined length does not appear and, before the head records a long-run-length synchronous pattern on the optical storage medium, if the first category pattern with a run length greater than the predetermined length does not appear for a time greater than a predetermined threshold, then select the Long run length sync patterns are a first class pattern.

Description of drawings

FIG. 1 is a schematic diagram of changes in output laser power of a laser diode when an optical drive performs a writing operation.

FIG. 2 is a schematic diagram of a possible data pattern of a sync code in the specification of a DVD-type optical disc.

FIG. 3 is a schematic diagram of an embodiment of the optical drive proposed by the present invention.

FIG. 4 is a schematic diagram of an embodiment of an encoder in the data generator of FIG. 3 .

FIG. 5 is a first example of a flowchart used by the sync pattern selection unit of FIG. 4 when selecting a 14T pattern category.

FIG. 6 is a second example of a flow chart used by the sync pattern selection unit of FIG. 4 when selecting a 14T pattern category.

FIG. 7 is a third example of a flowchart used by the synchronization pattern selection unit in FIG. 4 when selecting a 14T pattern category.

Description of figure number

200 discs 300 disc drive

310 shaft motor 320 read/write head

322 Laser Diodes 324 Photodiodes

326 photodiode integrated circuit 330 laser diode drive unit

335 data generator 340, 360 signal processor

345, 365, 370 sampling unit 350 servo control unit

375 power control unit 400 encoder

410 modulator 420, 460 multi-tasker

430 synchronous pattern generation module 440 synchronous pattern generation unit

450 Synchronous Style Selection Unit

Detailed ways

Please refer to FIG. 3 . FIG. 3 is a schematic diagram of an embodiment of the optical recording device proposed by the present invention. The optical recording device 300 in this embodiment is used to record a plurality of information units (information units) on an optical storage medium (opticalstorage medium) 200 in the form of a first type pattern and a second type pattern, wherein each An information unit includes a long run-length sync pattern. For the convenience of description, the DVD disc will be used as an example to illustrate the optical storage medium 200 shown in FIG. ; " is the 14T style in each frame sync code.

The optical recording device 300 in the present embodiment includes a spindle motor (spindle motor), used to rotate the optical disc 200; a data generator 335, used to generate data written in the optical disc 200, and send the generated data to the optical disc 200. to a laser diode (laser diode, LD) driving unit 330 . The laser diode driving unit 330 can generate a driving current I _out according to the data received from the data generator 335 , and transmit the driving current I _out to a read/write head 320 . The read/write head 320 includes a laser diode 322 , a photodiode 324 , and a photo diode integrated circuit (PDIC) 326 . The laser diode 322 is used to generate a laser light according to the driving current I _out , so as to write the aforementioned several information frames to the optical disc 200 in the form of a "space" pattern or a "mark"pattern; the photodiode 324 is used to receive the laser diode 322 The generated laser signal is used to generate a front photo diode output signal (front photo diode output, FPDO); the photodiode integrated circuit 326 is used to receive the light signal reflected from the optical disc 200 to generate relative A, B, C, D , E, F and other signals.

After receiving the A-F signal generated by the photodiode integrated circuit 326, a signal processor 340 can generate servo control signals (servo control signals) required for servo control work, such as tracking error signal TE and focus error signal FE. Under the control of the servo sampling enable signal servo_sample_enable generated by the data generator 335, a sampling unit 345 can sample the TE and FE signals under the read/erase power, and transmit the generated sampling signals to the servo control unit (servo controller) 350, and the servo control unit 350 can generate appropriate control signals to perform servo control on the read/write head 320.

The FPDO signal generated by the photodiode 324 is sent to a signal processor 360 for processing. Under the control of the read sample enable signal read_sample_enable and the write sample enable signal write_sample_enable generated by the data generator 335, the two sampling units 365 and 370 can sample the FPDO signal at read power level and write power level respectively. After the sampling signal is sent to the power control unit 375 , the power control unit 375 can generate an appropriate control signal to control the power level of the laser output from the laser diode 322 . Of course, if the optical disc 200 is a rewritable disc, the optical drive 300 can only use a single sampling unit to sample the erasing power level, and then the automatic power control related work can be performed.

In the data generator 335 , besides the circuit for generating each sampling enable signal, it also includes an encoder for generating the modulated data (modulated data) finally recorded on the optical disc 200 . Please refer to FIG. 4 , which is a schematic diagram of an embodiment of the encoder in the data generator 335 of FIG. 3 . The encoder 400 in this embodiment includes a modulator 410 for modulating the recording data into frame data in each frame on the optical disc 200 . A multiplexer 420 is used to switch the output frame data or frame sync code. A synchronization pattern generation module 430 is used to generate a frame synchronization code in each frame, which includes: a synchronization pattern generation unit 440 , a synchronization pattern selection unit 450 , and a multiplexer 460 . The synchronous pattern generation unit 400 is used for generating the synchronous pattern of the next information frame according to the next state corresponding to the end word code in each information frame. As previously mentioned, the synchronous code produced by the synchronous pattern generation unit 400 can have There are two different options, namely "Primary Synchronization Code" and "Secondary Synchronization Code". Controlled by the sync pattern selection unit 450, the multiplexer 460 is used to select the primary sync code or the secondary sync code to be output as the frame sync code of each frame. When the 14T pattern corresponding to the primary synchronization code is a "mark" pattern, the 14T pattern corresponding to the secondary synchronization code will be a "blank" pattern; when the 14T pattern corresponding to the primary synchronization code is a "blank" pattern, the secondary The 14T pattern corresponding to the synchronization code will be the "mark" pattern; therefore, the synchronization pattern selection unit 450 can decide whether to use the "mark" pattern or the "blank" pattern as the 14T pattern in each information frame according to the situation.

As mentioned above, limited by the settling time and sampling rate of the sampling units 345, 365, 370, and the writing rate of the optical drive 300, the sampling unit is usually only used when writing a fixed data pattern whose run length is greater than a predetermined length. Only 345, 365, 370 can effectively sample a specific signal (at this time, the data generator 335 will issue sampling instructions through the sampling enable signals servo_sample_enable, read_sample_enable, and write_sample_enable). For example, under the operating rate of 8 times speed, the preset length LEN_TH_MARK corresponding to the mark pattern and the preset length LEN_TH_SPACE corresponding to the blank pattern may be 6T, and at this time the sampling units 345, 365, 370 will only run lengths greater than The data pattern of 6T is sampled; and under the operating rate of 16 times speed, the preset length LEN_TH_MARK corresponding to the mark pattern and the preset length LEN_TH_SPACE corresponding to the blank pattern may become 12T, and the sampling units 345, 365, 370 can only sample data patterns with a run length greater than 12T (in this case, only the 14T pattern in the sync code can provide sufficient sampling time for the sampling units 345, 365, 370). Of course, in practical applications, the preset length LEN_TH_MARK corresponding to the mark pattern is not necessarily equal to the preset length LEN_TH_SPACE corresponding to the blank pattern.

Since the sampling unit 345 in this embodiment will sample the TE and FE signals when the head 320 writes a blank pattern with a run length greater than LEN_TH_SPACE into the optical disk 200, in order to ensure that the servo control work can be carried out normally, the sampling unit 345 Must have a sufficient sampling rate, preferably a blank pattern with a run length greater than LEN_TH_SPACE occurs at least more often than a certain value, in other words, the distance between two adjacent blank patterns with a run length greater than LEN_TH_SPACE Should not exceed a certain value N _space (unit is the number of info boxes). For example, assuming that the sampling unit 345 only samples the blank patterns of 14T, and assuming that the optical drive 300 operates at a write rate of 16X, the frequency at which the channel bits appear will be 419MHz, and the frequency at which the 14T patterns appear is 419MHz/1488 =281KHz; if the operating bandwidth of the servo control unit 350 is 20KHz, then the sampling rate of the sampling unit 345 must be at least 40KHz. At this time, in order to meet the needs of the servo control work, the aforementioned N _space can be set to 7 (281KHz/ 40KHz 7).

In order to meet the above requirements, when determining the category of a 14T pattern, the synchronous pattern selection unit 450 in this embodiment may execute the flow chart shown in FIG. 5 . That is, in step 510, it is first determined whether the blank pattern with a run length greater than LEN_TH_SPACE exceeds (N _space -1) information frames and has not appeared. In step 520, because the blank pattern with a run length greater than LEN_TH_SPACE has exceeded (N _space -1) information frames and has not appeared, so the synchronization pattern selection unit 450 can force this 14T pattern to be a blank pattern at this time to provide sampling Unit 345 performs sampling opportunities. In step 530, since the blank pattern whose run length is greater than LEN_TH_SPACE has already appeared in the previous (N _space -1) information frames, the synchronous pattern selection unit 450 can select this one according to the aforementioned DSV minimization principle The category of the 14T pattern, that is, select the 14T pattern as the category that can make the DSV have a smaller value (of course, this step can also use a random method to determine the category of the 14T pattern).

In addition, since the sampling unit 370 in this embodiment will perform sampling when the head 320 writes a mark pattern with a run length greater than LEN_TH_MARK into the optical disc 200, in order to ensure that the automatic power control can work normally, the sampling unit 370 must have Adequate sampling rate. Ideally, mark patterns with run length greater than LEN_TH_MARK occur at least more frequently than a certain value. In other words, the distance between two adjacent mark patterns with run length greater than LEN_TH_MARK should not be Exceeds a specific value N _mark (the unit is the number of information boxes). For example, assuming that the sampling unit 370 only samples the 14T mark pattern, and assuming that the optical drive 300 operates at a writing rate of 16X, if the operating bandwidth of the APC operation is 1KHz, then the sampling rate of the sampling unit 370 must be at least 2KHz, at this time, in order to meet the requirements of automatic power control, the aforementioned N _mark can be set to 140 (281KHz/2KHz 140). In addition, the sampling unit 365 performs sampling when the head 320 writes a blank pattern with a run length greater than LEN_TH_SPACE into the optical disc 200. However, in the foregoing example, the bandwidth required for the automatic power control operation is smaller than that for the servo control operation. Therefore, in this embodiment, the sampling rate required for servo work is still used to calculate the aforementioned value of N _space . In actual application, the preset length of the blank pattern corresponding to the sampling unit 365 sampling is not necessarily equal to the preset length of the blank pattern corresponding to the sampling unit 345 sampling. The flow shown is used to meet the requirements of the sampling unit 365. Since the operation principle remains unchanged, details are not repeated here.

In order to meet the requirements of the above-mentioned sampling unit 370, when determining the type of a 14T pattern, the synchronous pattern selection unit 450 in this embodiment may execute the flow chart shown in FIG. 6 . That is, in step 610, it is first judged whether the mark pattern whose run length is greater than LEN_TH_MARK exceeds (N _mark -1) message frames and has not appeared. In step 620, since the mark pattern with a run length greater than LEN_TH_MARK has exceeded (N _mark -1) information frames and has not appeared, so the synchronization pattern selection unit 450 can force this 14T pattern to be a mark pattern at this time to provide sampling Unit 370 performs sampling opportunities. In step 630, since the mark pattern whose run length is greater than LEN_TH_MARK has already appeared in the previous (N _mark -1) information frames, the synchronous pattern selection unit 450 can select this one according to the aforementioned DSV minimization principle The category of the 14T pattern, that is, select the 14T pattern as the category that can make the DSV have a smaller value (similarly, this step can also use a random method to determine the category of the 14T pattern).

Certainly, the flow charts in FIG. 5 and FIG. 6 can also be integrated into the flow chart shown in FIG. 7 , and since the operation principle remains basically the same, it will not be repeated here. Although the foregoing descriptions are made with the sampling units 345, 365, and 370 only sampling the 14T mark patterns and space patterns, in fact, when the writing rate is low, the values of the aforementioned LEN_TH_SPACE and LEN_TH_MARK are all the same. It can be set smaller. At this time, in the data area of each message box, the number of blank patterns with a run length greater than LEN_TH_SPACE and mark patterns with a run length greater than LEN_TH_MARK will become more, relying on these mark patterns in the data area And the blank style may have a way to provide sufficient sampling opportunities for the sampling unit 345, 365, 370, so the synchronous pattern selection unit 540 does not need to force the 14T pattern to be a marked pattern or a blank pattern too frequently, for most The 14T style can be determined according to the DSV minimization principle.

Compared with the practice of determining the category of each 14T model according to the principle of DSV minimization in the prior art, and in the case of US Patent Early Publication Case No. 2003/0053389, each multiple (for example, every two) In the information frame, a method of setting a long run-length synchronous pattern as a "label" pattern is fixed. When the optical drive and related methods proposed by the present invention determine the type of any 14T pattern, the servo control system at this time can be used. Or the power control system can select whether to force this 14T pattern to be a marked pattern or a blank pattern according to the sampling requirements of the long running length mark pattern or blank pattern. Only when the sampling demand to the marked style or the blank style is more urgent, the present invention will force the 14T style to be set as the marked style or the blank style; if the sampling demand to the marked style or the blank style is not urgent (for example The long run-length mark pattern or the blank pattern provided in the frame data have provided enough sampling opportunities for the servo control system and the power control system), then the present invention can determine it as Marked patterns or blank patterns can therefore have better adaptability than the methods used in the aforementioned two prior art.

Please note that although the work related to "power control" mentioned in the foregoing description refers to "automatic power control" (APC), in fact, the optical drive and related methods proposed by the present invention can also be applied Other different power control technologies, such as "running optimal power control" (ROPC) or "optimum power control" (OPC) and other power control technologies. And according to the sampling requirements of the used power control technology for the marked model or the blank model, determine the value of each parameter used in the present invention (for example, to determine whether the 14T model is forcibly set as the marked model or blank The parameters N _mark and N _space used in the model).

Claims (24)

1. An optical recording device for recording a plurality of information units on an optical storage medium in the form of a first type pattern and a second type pattern, characterized in that each information unit has a long run length Synchronous style, the optical recording device contains: a read/write head for outputting a laser to the optical storage medium to record the information units; and A synchronous pattern selection unit, used to select the category of long-run-length synchronous patterns of the information units, wherein, when selecting at least one category of long-run-length synchronous patterns, if the run length is greater than a preset length of the first category pattern If the non-occurrence time is greater than a preset threshold, the sync pattern selection unit selects the at least one long-run sync pattern as a first category pattern. 2. The optical recording device as claimed in claim 1, wherein when selecting the category of the at least one long run-length synchronous pattern, if the first category pattern whose run length is greater than the preset length does not appear for no more than the preset threshold, the sync pattern selection unit selects the at least one long-run sync pattern as a category that can make a digital sum value have a smaller value. 3. The optical recording device as claimed in claim 1, wherein the optical recording device determines the preset threshold according to a writing rate at which the information units are recorded on the optical storage medium. 4. The optical recording device as claimed in claim 1, wherein the first type pattern is a mark pattern. 5. The optical recording device according to claim 4, wherein the optical recording device further generates a first received signal according to the reflected light received by the read-write head from the optical storage medium; The optical recording device additionally includes: a first sampling unit, used for sampling the first received signal to generate a first sampling signal when the head writes a mark pattern with a running length greater than the preset length into the optical storage medium; and A first control unit is used for generating a first control signal to control the read/write head according to the first sampling signal. 6 . The optical recording device as claimed in claim 5 , wherein the signal state of the first sampling signal corresponds to the power of the laser light output by the read-write head when writing the mark pattern into the optical storage medium. 7. The optical recording device according to claim 6, wherein the first control unit adjusts the power of the laser light output by the read-write head when writing the mark pattern into the optical storage medium according to the first control signal . 8. The optical recording device as claimed in claim 1, wherein the first type pattern is a blank pattern. 9. The optical recording device according to claim 8, wherein the optical recording device further generates a second received signal according to the reflected light received by the read-write head from the optical storage medium; The optical recording device additionally includes: a second sampling unit, used for sampling the second received signal to generate a second sampling signal when the head writes a blank pattern with a running length greater than the preset length into the optical storage medium; and A second control unit is used for generating a second control signal to control the read/write head according to the second sampling signal. 10. The optical recording device as claimed in claim 9, wherein the signal state of the second sampling signal corresponds to the power of the laser light output by the read-write head when writing blank patterns into the optical storage medium. 11. The optical recording device according to claim 10, characterized in that the second control unit adjusts the power of the laser light output by the read-write head when writing blank patterns into the optical storage medium according to the second control signal . 12. The optical recording device as claimed in claim 9, wherein the second sampling signal is a servo error signal corresponding to the pick-up head. 13. A method for use in an optical recording device, characterized in that the optical recording device comprises a read/write head for storing a plurality of information units in the form of a first category and a second category The form of the pattern is recorded on an optical storage medium, wherein each information unit has a long run length synchronous pattern, the method comprising: counting the time when a pattern of the first category with a run length greater than a predetermined length does not appear; and before the head records a long-run-length synchronous pattern on the optical storage medium, if the first category pattern with a run-length greater than the predetermined length does not appear for a time greater than a predetermined threshold, the long-run-length is selected The synchronization pattern is a first category pattern. 14. The method of claim 13, further comprising: If the first category pattern whose run length is greater than the preset length does not appear for a time not greater than the preset threshold, then the long run length synchronization pattern is selected as a category that can make a digital sum value have a smaller value. 15. The method of claim 13, further comprising: The preset threshold is determined according to a write rate at which the read-write head records the information units on the optical storage medium. 16. The method of claim 13, wherein the first category pattern is a mark pattern. 17. The method of claim 16, further comprising: generating a first received signal according to the reflected light received by the read/write head from the optical storage medium; sampling the first received signal to generate a first sampling signal when the head writes a mark pattern with a running length greater than the preset length into the optical storage medium; and A first control signal is generated according to the first sampling signal to control the read/write head. 18. The method as claimed in claim 17, wherein the signal state of the first sampling signal corresponds to the power of the laser light output by the read/write head to write the marking pattern on the optical storage medium. 19. The method of claim 18, further comprising: According to the first control signal, the output laser power is adjusted when the read-write head writes the mark pattern into the optical storage medium. 20. The method of claim 13, wherein the first category pattern is a blank pattern. 21. The method of claim 20, further comprising: generating a second received signal according to the reflected light received by the read/write head from the optical storage medium; sampling the second received signal to generate a second sampling signal when the head writes a blank pattern with a run length greater than the preset length into the optical storage medium; and A second control signal is generated according to the second sampling signal to control the read/write head. 22. The method as claimed in claim 21, wherein the signal state of the second sampling signal corresponds to the power of the laser light output by the read-write head when writing blank patterns into the optical storage medium. 23. The method of claim 22, further comprising: According to the second control signal, the output laser power is adjusted when the read-write head writes the blank pattern into the optical storage medium. 24. The method of claim 23, wherein the second sampling signal is a servo error signal corresponding to the head.

Images