KR100268386B1 - Recording and controlling method of a dvd-ram drive - Google Patents

Abstract

The present invention relates to a recording control method for a DVD-RAM drive, comprising: an ECC block matching determination step of determining whether the last sector of recording data input from a host computer forms a 1ECC block, and the last sector of the recording data is 1ECC. When not forming a block, outputting a read command to read the disc in a continuous operation after write (WRITE), determining whether the sector to be written matches the ECC block, and the sector to be written to If the ECC block matches the ECC block, the ECC block is recorded at the corresponding position on the disk. If the sector to be recorded does not match the ECC block, the ECC block is read and modified continuously without performing a search according to the read command. ) Recording to the corresponding position. Therefore, before the ECC block is recorded, the present invention first determines whether the last sector to be recorded and the ECC block match, that is, the last sector forms a 1ECC block, and then applies a write command to the ECC processor. By modifying the corresponding ECC block without modifying it, the search time can be reduced, and the waiting time for reading is reduced, which can improve the recording performance of the entire DVD-RAM drive. There is.

Description

Recording control method of DVD-RAM drive

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording control method for a DVD-RAM, and more particularly, to a recording control method for a DVD-RAM drive that is modified and recorded for recording data on a disc.

Recently, digital video discs (DVDs) have been used to record and reproduce a large amount of data such as video and audio signals.In order to record a larger amount of data, high density recording technology and high precision detection technology have been used. There is a growing need for systems using magneto-optical disks. DVD-RAM is a storage medium for the next generation of digital data, and is expected to replace a hard disk with a large capacity.

DVD-RAM drives differ in the data units processed by the host computer and the data units written to the actual disc. In DVD-RAM drives, data is received in units of 2048 bytes when received from the host computer. When recording to disk, recording is performed in units of 32 kilobytes, or 1 Error Correction Coding (ECC) block, which is 16 times 2048 bytes.

FIG. 1 is a conceptual diagram for comparing and explaining a disc area to be recorded by a host computer and a disc area to be recorded on an actual disc when data is recorded. A represents the area that should be written to the actual disk.

For example, if a user wants to rewrite the A disk in the existing disk area where data is stored, the DVD-RAM drive records the modified E area because the DVD-RAM drive writes the disk in units of 1ECC (2048 bytes × 16). To read 1ECC block (D area), read it first, modify it, and write it to the corresponding area.

Next, the data areas forming one ECC block of the A areas are sequentially recorded.

Finally, in the step of recording the C area, the DVD-RAM drive recognizes that the C area does not form 1 ECC block, seeks the disc, and reads the B area in which the previous data is recorded first.

The modified C area is inserted into the read B area, modified, and recorded in the corresponding disk area.

In this way, the process of reading the previously recorded data, modifying the data, and then writing the data again is called a (RMW; Read Modify Write) process. If 1ECC blocks do not match when recording a large amount of data, the problem of RMW should be considered at the beginning and at the end.

As described above, when a conventional DVD-RAM drive receives a command to record data that does not match the ECC block boundary, the previous recording data of the disc is searched, read, corrected, and rewritten to perform the RMW. In order to do so, a process of searching for and recording back to a sector for recording a head is required.

That is, while the DVD-RAM drive recognizes that the last sector does not form the 1ECC block at the moment when the last sector C of the data to be recorded is to be recorded, and determines that the recorded 1ECC block B should be read first. The disk is already spinning.

Therefore, the disk area must be searched again to read the B area.

If this process is repeated several times, the recording speed of the DVD-RAM drive will be slowed down that much.

Accordingly, it is an object of the present invention to record data applied from a host computer in a DVD-RAM drive onto a disc, and immediately end the data without pausing or seeking the head for the RMW performed at the end. The present invention provides a recording control method of a DVD-RAM drive in which a portion of the 1ECC block B to be recorded is read and modified.

1 shows a DVD-RAM drive.

A feature of the present invention for achieving the above object is a first step of determining whether the last sector of recording data input from a host computer forms a 1ECC block in the recording control method of a DVD-RAM drive, the recording data A second step of outputting a 1ECC read command to read the disc in a continuous operation after OVERWRITE, when the last sector of the first sector does not form a 1ECC block, whether the first sector to be written coincides with the ECC block. In the third step of judging and when the first sector to be recorded coincides with the ECC block, the ECC block is recorded at a corresponding position on the disc. 1 is a recording control method of a DVD-RAM drive including a fourth step of reading and modifying an ECC block and writing data to a corresponding position.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 shows a DVD-RAM drive. The DVD-RAM drive has a pick-up and actuator module 2 for reading or writing signals from the disk 1 capable of reading and writing. The servo control unit 3 drives the pickup and actuator module unit 2 to move to a predetermined position. The ECC processor 4 performs error correction encoding (ECC encoding) on the data read from the pickup and actuator module unit 2 and outputs the data to the interface controller 5. In addition, the ECC processor 4 receives the data from the interface control unit 5, corrects the error correction decoding (ECC), outputs it to the pickup and actuator module 2, and writes the data to the disk 1. At this time, the microcomputer 7 controls all the above-described operations and performs the request of the host computer 20. The DVD-RAM drive also has a buffer 22 for buffering data from the host computer 20.

3 is a flowchart for explaining a recording control method for a DVD-RAM drive of the present invention.

2 and 3, an embodiment of the present invention in which a part of data previously stored in the DVD-RAM is modified by the host computer and then rewritten (OVERWRITE) will be described.

First, when the microcomputer 7 receives the OVERWRITE command from the host computer 20 through the interface controller 5 (step 310), the microcomputer 7 applies a drive signal to the servo controller 3 to record and read data. The pick-up and actuator module part 2 to operate.

The data received from the host computer 20 is stored in a buffer.

The microcomputer 7 determines whether the last sector of the data to be recorded forms the 1ECC block by using the information (recording address, sector number) of the recording command from the host computer 20 (step 311).

If the last sector to be overwritten does not form a 1ECC block, the microcomputer 7 writes data to the ECC processor 4 immediately after the oversight of the C area. ) Is issued to read the 1ECC block B to be inserted (step 312).

Next, or when the last sector C to be overwritten in step 311 forms the 1ECC block B, the microcomputer 7 determines whether the first leading sector to be written forms the 1ECC block. (Step 313).

When the 1ECC block is formed, the microcomputer 7 searches for the recording position of the disc in order to record the data received from the host computer 20 in the recording position (step 314). Then, the data received from the host computer 20 is written to the disk (OVERWRITE) (step 315).

In step 313, if the leading sector to be written does not form a 1ECC block, a disk search SEEK is performed to read the previously recorded 1ECC block D (which includes the leading sector to be written). (Step 316).

When the area D is found, the ECC processor 4 reads the 1ECC block D, inserts the area E into the area D, modifies it (step 317), and writes data to the disc.

The microcomputer 7 determines whether the sector to be recorded is the last ECC block while recording data transmitted from the host computer 20 to the disk (step 318).

If it is not the last ECC block, step 318 is repeated to continue recording data.

However, if it is the last ECC block, the ECC processor 4 immediately reads the 1ECC block B, inserts the C region into the B region, and modifies it (step 319). At this time, the operation of reading the 1ECC block B is automatically performed by the ECC processor 4 according to the command authorized in step 312.

After the modification is completed, the ECC processor 4 records the modified ECC block B in the corresponding disk position (step 321).

As described above, the present invention first determines whether the last sector to be written and the ECC block match, that is, the last sector forms the 1ECC block, before writing to the ECC block. By modifying the ECC block by reading the corresponding ECC block without performing the SEEK operation, the searching time can be reduced, and the waiting time for reading is also reduced. Therefore, the recording performance of the entire DVD-RAM drive can be improved.

Claims (2)

A recording control method for a DVD-RAM drive, comprising: a first step of determining whether a last sector of recording data input from a host computer forms a 1ECC block; A second step of outputting a 1ECC read command to read a 1ECC block of a disc including the last sector of the write data immediately after a write when the last sector of the write data does not form a 1ECC block; A third step of determining whether the first sector to be recorded coincides with the ECC block; And if the first sector to be recorded coincides with the ECC block, record the ECC block at the corresponding position on the disc, and if the first sector to be recorded does not match the ECC block, continuously read and modify the 1ECC block according to the read command. and a fourth step of modifying the data to the corresponding position. The method of claim 1, wherein the fourth step is to perform a read immediately without performing a search (SEEK) according to the read command.

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