TW459177B - High efficiency record method of the disc defect sector - Google Patents

Abstract

This invention is a method to record defect sectors in the disc medium. The disc medium which is like write-once and removable discs might generate a lot of consecutive defect sectors. In the disc medium, it uses the run-length limit (RLL) code to record addresses of defect sectors. For example, a group of the consecutive defect sector is recorded by the method of (N, L) in the primary defect list (PDL) of the defect management area. N is the initial sector of the consecutive sector, and L is the length of the consecutive sector. This invention is able to use the same defect management area to record more defect sectors. The record model of this invention is able to manage a lot of defect parts without increasing defect management areas.

Description

4 5 91 7 7 V. Description of the invention (1) [Scope of application of the invention] The present invention relates to a method for recording a defective sector in a disc medium. Furthermore, the disc medium has a The damage caused by repeated reading and writing which gradually deteriorates the quality. The present invention provides a concept of a Run-Length Limit (RLL) code for recording continuous defective sections of a disc medium. [Related technology of the invention] It is known that a disc medium such as a rewritable optical disc has a defective management area (defect management & ^ 85, referred to as 0) 4 persons 5) to record defective sections Or the madness block ((146〇1; block) 'The message area of the disc should contain all the information about the data alternation. Please refer to Figure 1A'. The message area of the rewritable disc is divided into Three parts: Lead-in area 'Data area and Lead-out area. Data area records user's data. The main message contains Lead-in area and Lead-out area. Defective sector address, there are a total of four DMAs, which are DMA 1 'DMA2' DMA3 and DMA4 'They are distributed in the Lead-in area and Lead-out area of the disc. The content of these four DMAs is consistent defect management. Information, the same information is stored in each DMA, it is backed up to prevent the suffering DMA itself from having madness, and it can be seen from the figure a that the DMA contains two parts. The first part is the main defect. Defect List 'PDL for short' records the following three conditions Defective section: 1. Defective section generated during the disc manufacturing process, 2. Defective section during the disc verification process

Page 4 45 917 7 V. Description of the invention (2) Defective segments present, 3. Defective segments transferred from the second part; The second part is a Secondary Defect List (SDL) record disc Defective blocks after film formatting. Each PDL entry (PDL entry) records a defective section, and its recording format is as shown in Figure 2. Each SDL series records a defective block, which defines a defective block with 16 defective sections. The following description The focus will be on algorithms for recording PDL. Please refer to Fig. 2. The PDL is composed of a series of all defective sections. Each _ column has three parts: the type of the series, the address of the defective section, and a reserved area. As in the aforementioned rewritable optical disc, its PDL serial format records a defective segment using only one PDL serial. If consecutive defective segments are found during formatting, then the corresponding PDL serial is required to record Defective sections 'for example' Defective sections transferred from one SDL require 16 PDL strings to record. Obviously, the aforementioned PDL recording method is not very efficient, especially when a large number of SDLs are transferred to PDL, where the defective sections of SDL are continuous for more than 5 pm, and the traditional p DL series (p DL entry) records a defective section. Therefore, recording a defective segment with a PDL string is very wasteful of memory space. [Objective and Summary of the Invention] The present invention relates to a method for efficiently recording defective sectors in a disc medium. 'Variables of defective sectors can be recorded in a defect list en try.' Using this recording method not only saves the memory space of the disc media and simplifies the management of the defect list. In order to achieve this, the defective areas recorded in the disc media should be exposed

45 917 7 V. Description of the invention The concept of RLL code in paragraph (3). The length definition of the conventional (d, k) RLL code is expanded to record consecutive hexadecimal digits of defective sectors to improve the recording efficiency. (d, k) RLL numbers are formatted as (N, l), which is a finite length representing a 1 + hexadecimal digit, with (N, L) representing a minimum of d consecutive hexadecimal digits and a maximum of k consecutive hexadecimal digits Carry number 'where n is the start of a group of consecutive segments. L is the length of a group of consecutive segments. For example, we can define the pDL serial format by recording the type of serial. The maximum length (k) and minimum length (d) of consecutive defective sections, so we can record at most k consecutive defective sections in a pj) L string, because 'removable discs are generally accidental Damage due to scratches or falls' and the damage suffered due to scratches or falls is usually a continuous segment, so 'use the RLL code of Heshu to record consecutive defective segments in the pDL string' can save s memory Space ', especially from sdl to a large number of pj) L. The defective section of sjilu from SDL to PDL, using the method of the present invention, occupies only 己 16 of the memory space of the conventional method. -Although the present invention has been disclosed in detail in the foregoing description, it is not intended to be used as an invention. Anyone skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of the Ming Dynasty shall be determined by the scope of the attached patent application. [Instructions] Figure 1A is a disc format of a conventional optical disc. FIG. 1B is a component of each region of the Chuan diagram. Fig. 2 'is a PDL serial format of a conventional removable disc. FIG. 3 is a PDL serial format of the present invention.

Page 6 4591 7 7 V. Description of the invention (4) Figure 4 is a flowchart of recording a defective section in a cymbal medium according to the present invention. Fig. 5 'is a comparison diagram of the recording efficiency of the conventional format and the RLL format. [Detailed description of the embodiment] There are many studies to improve the recording efficiency of binary data, and the present invention provides a new length definition of the RLL code to 'expand the continuous hexadecimal number of recordings' to improve recording defects in the disc media. Recording efficiency of the sector. The conventional (d, k) RLL code is a finite length representing a string of binary digits' which satisfies the following restrictions: (1) there are at least d zeros between any two consecutive ones, and (2) between any two There are at most k 0 between consecutive 1s. For example, a set of 14-bit (2'10) RLL codes to describe decimal ids, 5d, 64d, 100d, and 120d 'are represented as follows: ld = 100 000 100 000 00 00 00 b, 5d = 0 0 0 0 0 1 0 0 0 1 0 0 0 0 b '6 4 d = 0 1 〇〇1 〇〇〇1 〇〇1 〇〇b, 1 〇〇d = 01000100100010b and 120d = 01 〇 〇 〇 〇 〇 〇 〇 〇 〇b. ((1,1 ^) 1? 1111 number is formatted as (1 ^, 11), which is a finite length representing a series of hexadecimal digits, which meets the following restrictions: (1) represents at least d with (N, L) Consecutive hexadecimal digits, where N is the beginning of a string of numbers and L is the length of a string of numbers '(2) Representing at most k consecutive hexadecimal digits by (N, L)' where N is a string of numbers The initial number of L and L is the length of a string of numbers. For example, (1,16) RLL numbers can represent a series of hexadecimal digits, as follows: (15h, 5) = 15h, 16h, 17h, 18h and 19h

45 917 7 V. Description of the invention (5) (25h, 12) = 25h, 26h, 27h, 28h, 29h, 2ah, 2bh, 2ch, 2dh, 2eh, 2fh and 30h (aOh, 8) = aQh 'alh, a2h , A3h, a4h, a5h, a6h, and a7h are described using the optical disc as an example. The PDL of the defect management area includes all the strings identified as defective during the formatting process. The traditional serial format (as shown in Figure 2) There is a serial type and the number of the defective segment. This format uses a PDL string to record only one defective segment. The address recorded in the pdl is expressed in hexadecimal digits, and is a number of consecutive hexadecimal digits. The address string of the number is recorded in the PDL. 'Consecutive hexadecimal digits can be converted into (d, k) ru hexadecimal digits'. Its format is (N, L). If we define d = l, record in PDL. All the number of addresses in the list can be converted into a string of (丨, k) rlL's decimal place. 'We edited the 4-byte (by te) PDL string format in Figure 2 into the queue format in Figure 3. In Figure 4, the pDL serial format records the type of string in bits 30 to 31, which is the same as in Figure 2. Bits 24 to 29 Wu billion bits 23 - bit length are recorded and the start address of a group of contiguous segments flaws, turn from SDL into consideration pDL is a string of 16 consecutive bits hexadecimal 'Shu typically we define k = 6. Therefore, the number of bits used to record the "length" is equal to 4 '. In the new format, the muscle can record the hexadecimal number of the defective segment address at (1,16) RLL. According to the above strategy, the method for recording defective sectors (such as FIG. 4) of the present invention includes the following steps: Step 1: The disc driver reads out the defective sector address recorded in the PDL.

45917 7

V. Description of the invention (6) Step 2: Find the start address and length of each group of consecutive defective sections from the defective section addresses read in step 1. Step 3: Record the starting address and length of step 2 in the pDL sequence. Furthermore, the defect table provided by the present invention records the length of at least one consecutive defective sector and the start address of the consecutive defective sector. Regarding disc media, especially optical discs, there are three types of defective sections recorded in pDL: The defective section of the P-list (p-list) is generated during the manufacturing process of the disc. Defective sections of table 1 (G1-list) are discs found during the verification process. The defective sections of table 'h (G2 — list) are converted from defective sections recorded in SDL to PDL. In comparison, the conventional PDL serial format (currently removable optical discs as shown in Figure 2) uses a pDL serial to record a defective sector, while the PDL serial format of the present invention (as shown in Figure 3) can be used One PDL string records multiple defects. Using this method, the range of defective parts is 1, 1, β, and y times of the conventional format. The efficiency depends on the distribution of defective sections. In Figure 5, the required recording memory space for randomly distributing defective sections in the 0 data section is sighed by circles. The X axis is the number of defective sections and the Y axis is the number of PDL strings. I can see the records. The efficiency is that the present invention (solid line) is better than the current recording format (dashed line).

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Claims (1)

45S1 7 7 VI. Scope of Patent Application 1. A method of recording a defective sector on a defect list in a disc medium 'includes the following steps: Step one: each disc is read by a disc driver The address of the defective section; Step 2: Find out the starting address and length of each consecutive group of defective sections from the step-reading of the defective section address; and Step 3: Record the beginning of Step 2 The address and length are in the defect list entry. 2 _ The method for recording the defective section in the defect table in the disc medium as described in item 1 of the scope of the patent application, wherein the monthly disc is a disc and the defect table is the main defect table of the disc (Primary Defect List (PDL for short). 3. The method of recording the defective section in the disc medium as described in item 1 of the scope of the patent application, wherein the defective section has been generated during the disc manufacturing process. 4. The method for recording a defective section in a disc medium as described in item 1 of the scope of the patent application in the defect table, wherein the defective section was discovered during the disc verification process. 5. The method of recording a defective section in a disc medium as described in item 1 of the scope of the patent application, wherein the defective section is recorded in a Secondary Defect Llst (SDL) Defective section. 6. Record the defect in the disc media as described in item 1 of the scope of the patent application. Fang Mu, who is in the defect table, is willing to delete the start address and the length of the record. Page 10 45 917 7 VI. Scope of patent application Bits 0 to 23 and 24 to 29 of the main defect list. 7. The method for recording a defective section in a disc medium as described in item 1 of the scope of the patent application, wherein the length of the continuous defective section is limited to 16. 8. —A disc medium containing a defect list for recording defective 'defective sections' includes: a data area for storing data; at least one management defect area, the management defect area containing a defect list for recording each The length and start address of a set of consecutive defective sections; and the defective section in the data area is recorded in the management defective area. 9. The disc medium containing defect tables as described in item 8 of the scope of the patent application, which is used to record defective sectors, wherein the disc medium is a disc and the defect table is a main defect table of the disc. 1 0 · The disc medium containing a defect table as described in item 8 of the scope of the patent application for recording defective sections, wherein the defective sections have been generated during the disc manufacturing process. 11. The disc medium containing defect list as described in item 8 of the scope of the patent application is used to record the disc media of the defective area slave ', wherein the defective segment was discovered only after the disc was verified. 12. According to the disc media of the eighth defect segment in the scope of the patent application, where (Second Defect List) is included. The defect-containing list described in this item is used to record that the defect segment is protected by a secondary defect. The SDL is recorded in the table. Page 11 45 917 7 VI. The disc media of the defective section of the patent application, in which the start address and the length are recorded in bits 0 to 23 and bits 24 to 24 of the main defect list. $ 29. 1 4. The disc medium containing a defect table as described in item 8 of the scope of patent application for recording defective sections, wherein the length of the continuous defective section is limited to 16. Page 12