KR20060085513A - Pca area address set-up method of optical storage through pre-scanning of optimal power control area - Google Patents

Abstract

The present invention relates to a method of setting a PCA region address of an optical recording medium through pre-scanning of an optimal power control region, the method comprising: searching in advance a power adjusting region on the optical recording medium; And resetting the address of the PCA area to a part other than the defective area after searching for the defective area in the power control area.

CD, DVD, PCA, OPC, Optical Disc

Description

PCA Area Address Set-up Method of Optical storage through Pre-scanning of Optimal Power Control Area}             

1A to 1C are layout diagrams of recording areas of a typical CD-R / RW.

2 is a detailed diagram of a recording area of a general CD-R / RW.

3 is a flowchart illustrating a method of setting a PCA area address of an optical recording medium through pre-scanning of an optimum power control area according to an embodiment of the present invention.

The present invention relates to a method for setting a PCA area address of an optical recording medium through pre-scanning of an optimum power control area, and more particularly, in a drive for recording and reproducing CD-R / RW, The present invention relates to a method for preventing a disc recording failure due to a recording failure during an Optimal Power Control process.

As the storage capacity of existing CD-ROM titles has reached the limit, digital versatile discs (DVDs) have been in the spotlight as new storage media. The DVD is not much different from the CD in terms of implementation. That is, the data is recognized on the same principle as the CD for recognizing the data of 0 and 1 by the difference in the amount of light reflected by the laser. The difference is that the data storage is smaller than the CD.

These CDs and DVDs are classified into three types according to their functions and uses: read-only ROM, write-once worm type, and rewritable rewritable type.

The optical recording and reproducing apparatus for recording and reproducing the CD-based optical disc and the DVD-based optical disc records information on the optical disc by irradiating a light beam of a relatively large energy that can change the material properties of the information recording layer and record the information on the optical disc. The information is reproduced from the optical disk using a light beam of small energy that does not change the material properties of the layer. That is, during recording, information is normally recorded by driving the laser diode LD at a relatively high recording power to form pits on the optical disk. In this case, forming a pit by a predetermined length on the disk is referred to as a write strategy.

At this time, the laser light is incident on the opposite side of the reflective surface with a pit. Therefore, the pit appears as a projection when viewed from the laser incident side.

The pit has a width of 0.4 to 0.6 mu m, and the length of one pit and the interval between the pit and the pit are divided into 3T to 11T for CD series and 3T to 14T for DVD series. Here, T means the length of one clock pulse, 3T means three clock pulses, and 11T corresponds to the length of 11 clock pulses.

Unlike record-only discs, such recordable discs require complex algorithms and configurations for recording and are considered as a higher technology. In particular, in order to record on an optical disc, recording power must be defined. Which recording power is used is closely related to the recording quality and the reproduction quality to reproduce the data. However, in order for the recording power to be optimal, it is related to the performance of the disc and the recording device to be recorded. Therefore, it cannot be set as a uniform value, and the recording device itself finds the optimal recording power and uses it for recording. I'm trying to. Therefore, we have standardized the method of finding the optimal recording power, and this is generally called the optimum power control (OPC).

To this end, the recordable optical disc includes a PCA (Power Calibration Area), which is a test area for determining recording power, in an unused area of the innermost circumference.

FIG. 1A is a layout diagram of a recording area of a general CD-R / RW, which is divided into a clamping area 10 clamped by a clamper and a recording area 20 in which data is recorded and reproduced. The recording area 20 is again a power calibration area (PCA) 22 for determining an appropriate laser power for data to be recorded in the radial direction, and a program memory area having information on data being recorded. area (PMA) 24, a lead-in area 26 for recording information on recorded data, a user data area 28 where user data is recorded, and a lead-out located at the outermost circumference A lead out area 30 is included.

The PCA 22 is divided into a test area for testing laser power when performing OPC and a count area for recording the number of tests, that is, the number of repeated recordings, as shown in FIG. It is divided into partitions. Therefore, the test can be performed up to 100 times, and if more than 100 times, recording is no longer possible even if the recording space remains.

At this time, one partition of the test area is composed of 15 sectors, as shown in FIG. 1C, and one partition, that is, 15 sectors is used in one test write. That is, if one OPC is performed, test writing can be performed with 15 laser outputs for 15 sectors.

To this end, the optical disc recording / reproducing apparatus first reads the Absolute Time In Pregroove (ATIP) information recorded on the disc, and divides the recording power into 15 stages based on the reference power recommended by the disc manufacturer to test the test area of the PCA 22. Write a random or nT EFM (Eight to Fourteen Modulation) signal. Then, this is reproduced, and when the peak hold and the bottom hold of the reproduced signal are properly balanced, the assumption is made that the appropriate recording power is assumed, and then the recordable user area 28 is determined with the determined recording power. Record the data in. The reference power is encoded in special information of the ATIP in the lead-in area.

As shown in FIG. 2, the PCA (Power Calibration Area) area is composed of 100 test areas and count areas. The test area and the start area of the count area on the disc are CD-R / RW type and maximum support. The standard is given according to the double speed. If there is a media failure in which the disc signal cannot be read in this area, there is a possibility that a write failure may already occur during the OPC process for power setting, regardless of the write failure in the program area for data recording. It is necessary to adjust the recordable PCA area.

When recording on a specific disk with this medium defect at present, it is possible to use a method of skipping the OPC process itself so as to record only internally determined light quantity, but this method is also caused by the deviation of the drive and the disc itself. There may still be a problem where a write failure occurs.

The present invention has been made to solve the above problems, the object of which is to pre-scan the PCA area before the OPC process after the initial recognition of the disk information, if the media failure is found, the PCA area capable of recording By recalculating and setting, there is provided a method of solving a problem that a write failure may occur in the OPC process.

In order to achieve the above object, the PCA region address setting method of the optical recording medium through pre-scanning of the optimum power control region of the present invention comprises the steps of: searching in advance a power adjusting region on the optical recording medium; And resetting the address of the PCA area to a part other than the defective area after searching for the defective area in the power control area.

In the present invention, the address of the PCA region preferably includes a start address of a test area and a start address of a count area.

In the present invention, the method of resetting the address of the PCA region is preferably reset from the ATIP where a defect is found.

The present invention addresses the failure of recording in the OPC process due to the failure of the medium of the power calibration area (PCA) area used to determine the optimal light quantity value among the media recorded by the CD-R / RW recording drive. It is a suggestion. By scanning the PCA area for each media in advance and performing OPC test while skipping the bad media among the PCA areas that are set to be recorded, the recording quality corresponding to the drive's media can be improved by preventing the recording failure that may occur during OPC process. It is to let.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In adding reference numerals to components of the following drawings, it is determined that the same components have the same reference numerals as much as possible even if displayed on different drawings, and it is determined that they may unnecessarily obscure the subject matter of the present invention. Detailed descriptions of well-known functions and configurations will be omitted.

3 is a flowchart illustrating a method of setting a PCA area address of an optical recording medium through pre-scanning of an optimum power control area according to an embodiment of the present invention.

Step 301 is a process of scanning the PCA area in advance, and scans the test area and the count area of the PCA area before recording data on the optical recording medium, which scans the test area having the greatest influence on the recording. It is preferable that this is mainly focused.

Step 302 is a process of determining whether a defect exists in the area, and it is determined whether or not a defect is generated in the test area and the count area scanned in the step 301 so that writing to the defect area is difficult.

Step 303 is a process of resetting the start address for the count area and the test area. When the defective area is found, the start address (T_st) of the test area and the count area of the test area from ATIP outside the portion having the defective area is found. Reset the starting address (T_sc_).

Step 304 is a process of setting the start address of the test area and the count area according to a predetermined specification when no defective area is found in the PCA area of the optical recording medium. The above specification can be implemented in various ways according to the type of optical recording medium. However, in case of CD R / RW, the start time of the test area based on the lead-in start time (Rsl) is Tsl-00: 15: 35 ATIP [Min : Sec: Frame] and the count time start time is set to Tsl-00: 13: 55 ATIP [Min: Sec: Frame].

Step 305 is a process of storing the correction information for the medium, and stores the information on the start time set in step 304.

Step 306 is a process of adjusting the optimum power, and executing the process of setting the optimum power of the optical recording medium using the start time set above.

4 is a block diagram illustrating an embodiment of an optical disk drive supporting both a CD-R / RW system and a high-density CD-R / RW system according to the method of determining a recording medium type of the present invention.

The optical recording medium is a disk 401, and includes a spindle motor 402 for driving a disk rotation, a spindle motor driver 403, and a pickup section 404 for recording or reproducing data on the optical disk 401. The pickup unit 404 includes an optical pickup 404a, an LD driver 404b, and an I / V amplifier 404c. It also includes a sled motor 405 for pick-up driving, and a driver 406 for focusing / tracking / sled driving during reproduction or recording of the disc data by optical pickup. And a recording LD controller 407 for controlling the recording LD power by the LD driver 404, an RF amplifier 408 for processing RF signals during data reproduction or recording of the optical disc, encoding of recording or reproduction data, or A codec 409 for decoding, a host computer 410 for controlling the entire optical disk drive, an OPC / ROPC circuit 411 for optical power control processing, and a start time reset for a defective area of the PCA area. It includes a micro-controller 412, a digital servo processor 413 to perform the servo control under the control of the micro-controller 412.

When recording or reproducing data, a signal is required to perform data encoding or decoding in the codec 409 under the control of the host computer 410 and to record the corresponding data through the recording LD controller 407 and the RF amplifier 408. Processing and processing are performed, and the reproduction signal is processed by the RF amplifier 408 and decoded via the codec 409. The recording data or the reproduction data will be recorded or reproduced in the proper format on the disc 401 by the pickup section 404, and the digital servo processor 413 will focus on the focusing / tracking / sled driver by the microcontroller 412. The pickup unit 404 is controlled through 406. Further, the spindle motor 402 is driven through the spindle driver 403 to drive the optical disk 401 at a constant speed.

As described above, the micro controller 412 is responsible for resetting the address according to the discovery of the defective area. That is, when the microcontroller 412 scans the defect area and sets the start time accordingly, it is transmitted to the digital servo processor 413 to perform an optimal power adjustment process using the start time.

As described above, it has been described with reference to the preferred embodiment of the present invention, but those skilled in the art various modifications and changes of the present invention without departing from the spirit and scope of the present invention described in the claims below I can understand that you can.

As described above, according to the present invention, among the various recording failures that may occur during CD-R / RW disc recording, the recording success rate can be improved by preventing the recording failure during the OPC process, and it is possible to provide flexibility for recording media that will be more diverse. It can respond.

In addition, not only the CD-R / RW but also the DVD-R / RW recorder, which is becoming more common in recent years, can be seen as a method of increasing compatibility with the corresponding recording in a similar manner.

Claims (3)

Searching for a power adjusting area on the optical recording medium in advance; And resetting the address of the PCA area to a part other than the defective area after searching for the defective area in the power control area, and then pre-scanning the PCA area of the optical recording medium. How to set the address. The pre-scanning of the optimal power control region according to claim 1, wherein the address of the PCA region includes a start address of a test area and a start address of a count area. To set the PCA area address of the optical recording medium The method of claim 1, wherein the method of resetting the address of the PCA area is set from the ATIP where the defect is found. The PCA area address setting of the optical recording medium through the pre-scanning of the optimum power control area. Way.

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