KR100188948B1 - Random access examination method of compact disc driver - Google Patents

Abstract

The present invention relates to a random access test method of a compact disk drive, wherein a first header and a second header are provided for each sector, and the first header has an address of the sector, and The second header is characterized by using an inspection disk in which the address of the sector to be inspected is recorded in the next step, so that uniform inspection can be always performed under the same conditions.

Description

How to Check Random Access on Compact Disk Drives

1 is a schematic block diagram showing a sector structure of a general inspection disk.

2 is a schematic flowchart showing a conventional random access check algorithm.

3 is a schematic block diagram showing a sector structure of a test disk according to the present invention.

4 is a schematic flowchart of a random access check algorithm using the test disk of FIG.

* Explanation of symbols for main parts of the drawings

4: Synchronizing part 5a: First header

5b: Second header 6: Data part

The present invention relates to a random access test method of a compact disk drive.

In a general compact disk drive inspection process, a predetermined inspection disk is mounted in the disk drive, and then data and access time read by an inspection personal computer (PC) are inspected. 1 is a schematic block diagram showing a sector structure of a general inspection disk. As shown in the drawing, a general inspection disk is divided into a synchronization unit 1, a header 2, and a data part 3 for each sector. In the synchronization unit 1, information indicating the starting point of each sector is stored, an address of the sector is stored in the header 2, and data for inspection is stored in the data unit 3.

In the process of performing a test using such a test disk, the mode of the test according to the access type is typically a full access test or a 1/3 access test (1 /). 3 Access Test, and Random Access Test.

The full access check is a mode in which sectors of the longest distance of the check disk are read repeatedly to check each data and access time. The 1/3 access check is a mode in which sectors of a point that can be divided into three parts for the check disk are repeatedly read to check each data and access time.

The random access check is a mode in which sectors randomly selected from among sectors of the check disk are read to check each data and access time. Among the three check modes, the full access check and the 1/3 access check can be performed under the same conditions because the addresses of the target sectors are scheduled. In contrast, in the case of the random access check, the target sectors are irregularly arranged according to a method of generating a random address, so that a uniform check cannot be performed under the same conditions.

2 is a schematic flowchart showing a conventional random access check algorithm. An inspection algorithm as shown in FIG. 2 is performed on the inspection PC. This is described as follows. First, the stop position of the pickup in the disc drive is read (step 1). Here, the stop position means a position where the pickup is stopped after power is applied to the disk drive and performs its own initialization and series of servo control. Next, the address of the sector is transferred to the disk drive to read data about the sector and calculate an access time (step 2). Next, it is checked whether there is an error in the read data, and if there is an error, the result is stored and then asked whether the inspection is to be finished (step 3). If a command not to terminate is inputted, it is checked whether the access time exceeds a predetermined upper limit value, and if the upper limit value is exceeded, the result is stored and the user is asked whether the inspection is to be terminated (step 4). If a command not to terminate is inputted, it is checked whether the final address has been transmitted, and if the final address has been transmitted, the test is terminated. Otherwise, the process after the second step is repeated (step 5).

The conventional random access inspection method as described above has a problem in that uniform inspection cannot be performed under the same conditions because the sector addresses transmitted from the inspection PC are irregularly arranged.

The present invention has been made to solve the above problems, and an object thereof is to provide a random access test method of a compact disc drive, which can always perform a uniform test under the same conditions.

In order to achieve the above object, the random access check method of the compact disc drive according to the present invention includes a first header and a second header for each sector, wherein the first header has an address of the corresponding sector, and the second header has a second header. The next step is to use an inspection disk in which the address of the sector to be inspected is recorded.

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

3 is a schematic block diagram showing a sector structure of a test disk according to the present invention. As shown, the inspection disk according to the present invention includes a synchronous unit (4), a first header (5a), a second header (5b), and a data unit (data part) for each sector. Are separated by). In the synchronizer 1, information indicating a starting point of each sector is indicated. In the first header 5a, an address of a corresponding sector is provided. In the second header 5b, an address of a sector to be checked in a next step is obtained. The inspection data is stored in the section 6. In this way, the sector address of the next moving position of the pickup is recorded in the second header 5b, and random access inspection is performed accordingly, thereby ensuring uniform inspection at all times under the same conditions. Will be able to perform

4 is a schematic flowchart of a random access check algorithm using the test disk of FIG. An inspection algorithm as shown in FIG. 4 is performed on the inspection PC. This is described as follows. First, the stop position of the pickup in the disc drive is read (step 1). Here, the stop position means a position where the pickup is stopped after power is applied to the disk drive and performs its own initialization and series of servo control.

Next, the first sector address is transferred to the disk drive (step 2). Next, the next address recorded in the second header (5b in FIG. 3) of the sector is read (third step). The data is then read and the access time is calculated (step 4). Next, it is checked whether there is an error in the read data, and if there is an error, the result is stored and then asked whether the inspection is to be finished (step 5). If a command not to terminate is inputted, it is checked whether the access time exceeds a predetermined upper limit value, and if the upper limit value is exceeded, the result is stored and the user is asked whether the inspection is to be terminated (step 6). If a command not to end is inputted, check whether the final address has been transmitted, and if the final address has been transmitted, the inspection is terminated. Otherwise, the process after the third step is repeated by transmitting the next address read (step 7). . Thus, by recording the next address of the pickup in the second header (5b in FIG. 3) of the sector, it is possible to always carry out a uniform inspection under the same conditions.

The present invention is not limited to the above embodiment, and its use and improvement are possible at the level of those skilled in the art.

As described above, according to the random access test method of the compact disc drive according to the present invention, it is possible to always perform a uniform test under the same conditions.

Claims (4)

A first and second headers are provided for each sector, and the first header and the second header are used, and the second header uses an inspection disk in which the address of the sector to be checked is recorded in the next step. Access test method for compact disc drives. The method of claim 1, wherein the random access test method comprises: a first step of reading a stop position of a pickup in a corresponding disk drive; Transmitting a first sector address to the disk drive; Reading a next address recorded in the second header of the corresponding sector; A fourth step of reading the data and calculating an access time; A fifth step of checking whether there is an error in the read data, storing the result if there is an error, and then asking whether to end the test; A sixth step if a command not to terminate is input, checking whether the access time exceeds a predetermined upper limit value, and if the upper limit value is exceeded, storing the result and asking whether to terminate the inspection; A seventh step of checking whether the final address has been transmitted when a command not to terminate is completed, and ending the check if the final address has been transmitted, and repeating the process after the third step by transmitting the next address read if not; Random access check method for a compact disc drive, characterized in that it includes. The compact position as claimed in claim 2, wherein the stop position of the first step is a position at which pickup is stopped after power is applied to the disk drive to perform self initialization and series of servo control. How to check random access of disk drives. And a first header and a second header for each sector, the first header having the address of the sector and the second header having the address of the sector to be checked in the next step.