This standard specifies two sets of commands for media error monitoring and reporting used to verify data stored on digital data optical discs: - High-end standard, using a set of functional command sets; - SCSI-2 standard, using a set of SCSI-2 command sets. This standard also specifies two levels of media error monitoring and reporting. - System level, which is a named set of functions that can be used by the operating system, application software, and remote end users; - Optical disc device level, which is a set of SCSI-2 command sets that can be used by a device driver or a device application. Chapter 4 of this standard specifies matters that require compliance. This standard applies to both rewritable and read-only optical disc media. Some of the information in this standard may be useful to CD-ROM subsystems, but the implementation of this technology is outside the scope of this standard. GB/T 19729-2005 Media error monitoring and reporting technology for verifying data stored on electronically imaged digital data optical disks GB/T19729-2005 Standard download decompression password: www.bzxz.net
This standard specifies two command sets for media error monitoring and reporting for verifying data stored on digital data optical disks: - High-end standard, using a set of functional command sets; - SCSI-2 standard, using a set of SCSI-2 command sets. This standard also specifies two levels of media error monitoring and reporting. - System level, which is a set of named functions that can be used by the operating system, application software, and remote end users; - Optical disk device level, which is a set of SCSI-2 command sets that can be used by a device driver or a device application. Chapter 4 of this standard specifies matters that require compliance. This standard applies to rewritable and read-only optical disk media. Some of the information in this standard may be useful to CD-ROM subsystems, but the implementation of this technology is not within the scope of this standard.

ICS37.080
National Standard of the People's Republic of China
GB/T 19729--2005/1S0 121422001 Electronic imaging-Media error monitoring and reporting techniques for verification of stored data on optical digital data disks (ISO 12142.2001, IDT)
2005-04-19 Issued
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Standardization Administration of China
2005-10-01 Implementation
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CB/T19729-2005/IS012142:2001 This standard is equivalent to ISO12142:2001 & Electronic imaging digital data optical disk storage data verification media error monitoring and reporting technology (English version).
Appendix A, Appendix B, Appendix C: and Appendix D of this standard are informative appendices. This standard is proposed and managed by the National Technical Committee for Document Imaging Technology Standardization (SA(/TC86). The standard was drafted by the Fifth Subcommittee of the National Technical Committee for Document Imaging Technology Standardization. The main drafters of this standard are: Cheng Zhen, Li Ming. GB/T19729--2005/1S0 12142:2001
Management of data and records in many organizations already use optical disk-based information systems to store and retrieve large data sets and store valuable information. The optical disk devices that are part of these systems are designed with powerful but limited error correction capabilities. If the error level in a sector of a digital data optical disk exceeds the error detection and correction mechanism used by the optical disk drive device controller, that sector will not be corrected (data loss will occur). System managers wish to be able to verify the storage of information on digital data optical disks using quality error detection and reporting techniques, both when the data is initially transferred to that media and then periodically to monitor the status of the data. The optical disk drive controller modifies the media error level to indicate the status of the data stored on these digital data optical disks. This standard provides two ways to use media error monitoring and reporting technology to verify the data stored on digital data optical disks: one way using a high-end function command set; and the other way using a set of SCSI-2 command sets. The high-end interface is independent of the main operating system (such as IXU5, UNIX, OS/2, etc.) and the communication interface between the optical disk device and the host (such as SCS1-2, IP1, LAN, etc.). In addition, this high-end interface is independent of the media category and model, which means that it can be used in systems that use write-once, read-once (WORM), rewritable or partially read-only media, and can also be used in optical disk systems that use different models of media ranging from 90mm to 356mm. Standardized information about media error levels enables end users and system integrators to detect and The same information can be retrieved even if their configurations include different types of devices. This information can be retrieved using the same software and can be entered into a utility or device driver that monitors media error information. By using a selected set of SCS1-2 commands, SCSI interfaces are used in place of high-end interfaces. This selected set of SCSI-2 commands enables manufacturers to: develop data validation tools that are independent of drive device class and model by using media error monitoring and reporting technology at the SCSI level: use a selected set of standard command sets and methods to perform media error monitoring and reporting, allowing any application to use a common set of software tools without having to switch from one driver to another. Media error information that can be obtained by using high-end or SCSI-2 tools includes: - ---a list of reallocated sectors
modifications for sectors exceeding certain media error levels: a pair of alarms for exceeding certain validation media error levels; - total number of bytes in error, number of bytes in error per sector, and maximum number of bytes in error in any sector codeword; - contents of sectors that have been uncorrected or corrected; - errors encountered while reading disc header information, such as sector addresses, sector markers, and synchronization signals; - maximum length of contiguous defective bytes. By obtaining optical disc information systems that follow this standard, system administrators will be able to obtain media error information for optical disc drives that implement ISO/IEC 9316:1995 at both the functional (higher) level and the interface level. These tools provide a means to better understand the state of information stored on digital data optical discs. These tools provide a timely and economical means to design more effective media error monitoring and reporting techniques, and to implement data verification and replication strategies required when transferring recorded data to similar or different media. These media error monitoring and reporting techniques also enable system administrators to obtain media error information in near real time or off-line operation. These techniques provide data recovery and media error monitoring tools of varying sophistication. The ability to obtain information about media errors can indicate trends for selected discs or for the entire data collection. Deciding how often to use these tools and how complex they should be is not part of this standard.
1 Scope
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GB/T 19729-—2005/ISO 12142:2001 Electronic imaging of digital data discs - Multimedia error monitoring and reporting techniques for data verification on optical discs
This standard specifies two command sets for media error monitoring and reporting for verification of data stored on digital data discs: the high-level standard, which uses a set of functional command sets: the SCS1-2 standard, which uses a set of SCS1-2 command sets. This standard also specifies two levels of media error detection and reporting: a system level, which is a set of functional command sets that can be used by the operating system, application software, and remote users; and an optical disc device level, which is a set of SCSI 2 command sets that can be used by a device driver or a device application. Chapter 4 of this standard specifies matters that require compliance. This standard applies to rewritable and read-only optical disk media. Some of the information in this standard may be useful for CLROM subsystems. The implementation of this technology is outside the scope of this standard. 2 Normative references
The clauses in the following documents become clauses of this standard through reference in this standard. For dated references, all subsequent amendments (excluding erroneous incorporation) or revisions do not apply to this standard, however, parties that reach an agreement based on this standard are encouraged to use the latest versions of these documents. For undated references, the latest versions of the documents apply to this standard. [ISO/1EC9316:1995 Information Disclosure Technology - Small Computer System Interface - 2ISO12651:1999 Electronic Imaging - Vocabulary 3 Terms and Definitions
The terms and definitions defined in ISO/IFC9316:1995 and ISO12651:1999 and the following terms and definitions apply to this standard. 3.1
band
a specified number of contiguous tracks:
note, a useful identifier in locating multiple bits of a disc and physically indicating the number of misreads on the media. 3.2
byte error rate; BER the total number of byte errors in a given sample divided by the sample size. 3.3
constant angular yelocity a recording method in which the number of clock cycles per revolution is a constant that is independent of the radius. Note: this method means that the number of data per track is independent of the radial position of the disc. 3.4
continuous-servomediacontinuous-servomediaa medium in which the servo information recorded along the tracks is continuously available. 3.5
data fielddata field
a section recording sectors for user data, defect management indicators, periodic redundancy detection and error correction coding, etc. GB/T 19729—2005/IS0 12142:20013.6
Format
The arrangement or planning of optical disk data.
Initial device inifiator
A SCSI device that requests another SCSI device (target device) to perform an I/O) process. 3.8
Interleaving
The process of locating the physical sequence of data units to protect the data from burst errors. 3.9
nativeformat
Error correction code (ECC) data and control bytes, and escape byte. 3.10
Reed-Solomon codesReed-Solomon codes are error correction codes used specifically for the presence of burst errors or strongly correlated errors. 3.11
sampled-servn media
sampled-servn media
On which the focus information and the servo information and clock information recorded along the tracks are obtained by periodically sampling the disc information.
Target devicetarget
The SCS1 device that performs an operation based on the initial device request. 3.13
Verification of dataVerification of data integrity and status.
4 Requirements
This standard specifies the following two levels of conformance: a basic level, using a minimum set of functions and commands; an extended level, based on the use of all basic level functions and commands, plus a media error log (MEDIAERRORLOG) and user-configurable optical device programmable media error level (Media Error Level) The extended level also allows the user to access the optical disk system using functional commands, or to access the optical disk device using a set of SCSI2 commands, to query the current settings of the optical disk device, to set the media error level, and to set the verify media error level.
The conformance clauses required by this standard shall describe the conformance of the basic or extended level applied at the system level interface and the device level. When an optical disk-based information system meets all the requirements determined in Chapter 7 (basic or extended level conformance), it conforms to this standard.
When an optical disk device that follows ISO/IEC9316: meets all the requirements determined in Chapter 8 (basic level extended level conformance), it conforms to this standard.
Table 1 summarizes the conformance of the basic and extended levels at the optical disk system level (system level). Table 2 summarizes the conformance of the basic and extended levels at the optical disk device level (optical disk device that applies the SCSI-2 command set). Table 1 System-level consistency
The system functions are as follows: Functional description
Define media error recovery procedure (DMFRP)
Read defect data list (RDDL)
Read media error data (REMEL)
Read log data (RD)
Media error log and current media error level Set media error level (SMEL)
Set verify media error level (SVMEI.) Table 2 Optical disk device-level consistency
Use optical disk device SCS1 2 Command set
Format unit command
Log selection command can be used for the following:
Media error log page
Clear media error log page
Log indication command and the following:
…Media error log page
--Clear media error log page
Mode selection command and the following:
Read and write error recovery page of optical disk device
Verification recovery page of optical disk device
Mode indication command and the following:
--Read and write error recovery page of optical disk device
Verification recovery page of optical disk device
Read defective data command and HI, SI. and WI1
Read full length command
Request indication command. Indication key 01 h or 03h, use the relevant ASC or ASCQs verification command
write and verify the command
5 Convention
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GB/T 19729—2005/ISO 12142:2001 Degree of conformity
Basic level
Basic level
. Degree of conformity
Extended level
This standard follows the convention of 4.2 in ISO/IEC9316:1995. For ease of identification, the first letter of the English command of "medium error level" and "verification media error level" used in this standard is capitalized. The following conventions are taken from IS0/IEC9316:1995: A number not followed by a lowercase b or h is a decimal value; a number followed by a lowercase h is a unary value; a number followed by a lowercase h is a hexadecimal value. GB/T 19729--2005/ISO 12142:20016 Media Error Monitoring Technology Capabilities
The high-level interface functions identified in Chapter 7 and the application SCSI-2 defined in Chapter 8 provide two ways of detecting the following optical disc information:
Empty sector overhead (when there is a reallocation table, or when there is a list of addresses of replaced sectors and their replacements, the physical address of each reallocated sector and the address of the empty sector are still available in the reallocation table). Correction of media error levels exceeded
--Alarms for reaching the verified media error level: total number of error bytes, number of error bytes per sector, maximum number of error bytes in any coding; -Uncorrected or corrected sector content: errors encountered when reading header information (error ID information, sector mark loss information, data synchronization information and recovery synchronization mark information); bzxZ.net
--Maximum length of contiguous defective bytes. The media error level and the verified media error level can be set. 7 "High-level Technology
7. 1 Introduction
The purpose of this chapter is to provide high-end (a set of functional command sets) media error monitoring and reporting technology for verifying data stored on digital data optical disks. Implementation of this standard can achieve the following: - Establish media error levels. Whenever a certain media error level is exceeded, sectors can be reallocated; - Get the value of the media error level
- Establish a verification media error level. When a certain verification media error level is exceeded, early warning information about the data status can be obtained;
Get the value of the verification media error level;
- Get information about all reallocated sectors and a defect list of initial media defects; retrieve information about media error activity detected by the drive device in a media error log - Get corrected sector content or uncorrected sector content, including data blocks and error correction code bytes. The high-end interface method is independent of the operating system (such as: IOS, EJNIX. (S/2, etc.), and is also independent of the interface between the optical device and the host (such as: SCSI2, IPI, I.AN, etc.). In addition, this high-end interface is related to the media type and model. That is, it can be used in systems using different types of optical disk devices (from 90mm to 356mm), which may be wORM, rewritable or partially read-only media.
The optical disk error standard format will allow the same information to be retrieved from a configuration consisting of devices of different classes, models and manufacturers by using the same routines integrated into the media error information utility or device driver. 7.2 Function Commands
The following function commands or high-level (host) commands should be used to verify the data. 7.2.1 General Command Descriptions||tt t||This standard uses the following command syntax:
Command name [parameter parameter 2 or parameter 3].. [parameter n] The command name carries at least one parameter, and a parameter that is open can be expressed as: "parameter ON"
7.2,2DefineMediaErrorRecoveryProcedures.DMERPThe DMERP command should be used to define the following error recovery procedures for optical disk devices:Media Error Report:
...Media error data transfer to be performed. The default value of parameters not otherwise specified is ()FF.IMERP WR ONT FRE
OFF"L
ONTTRRE
OFF"L
OFF"
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GB/T19729—2005/IS012142:2001WRSectorReallocationonWriteFrrnr.…ON: During a write operation, if the optical drive device encounters an error that exceeds the medium error level set, the optical drive device error recovery process can automatically reallocate one or more sectors to a free sector area on the optical disc. OFF: During a write operation, if the optical drive device encounters an error that exceeds the medium error level set, the optical drive device error recovery process cannot automatically reallocate one or more sectors. RE: Sector Reallocation on Read Error V: When reading one or more sectors, if the optical drive device encounters an error that exceeds the medium error level set, the optical drive device error recovery process can automatically reallocate one or more sectors to a free sector area on the optical disc. UFF: When reading one or more sectors, if the optical drive device encounters an error that exceeds the medium error level set, the optical drive device error recovery process cannot automatically reallocate one or more sectors to a free sector area on the optical disc. RRE: Report recovered errors (RcportRecoveredErrors) ON: The optical disc device reports the recovered errors to the host; OFF: The optical disc device will not report the recovered errors to the host. 7. 2. 3 Read Defect Data List (RDDL) RI>DI. command should be used to read the defect data list from the optical disc device. See Table 3 for the defect data list. Table 3 Defect Data Table
Number of Entries in Table (MSH)
Number of Entries in Table (LSH)
Number of Defective Sector Tracks (MSB)
Number of Defective Sector Channels
Number of Defective Sector Tracks (1.SB)
Number of Defective Sectors
Number of Defective Pre-Sector Tracks (MSB)
Number of Defective Sector Tracks (LSB)
Number of Defective Sectors
RDD (List Size)
The list size specifies the number of bytes to be transferred in hexadecimal. The defect list data shall be returned to the drive in the format shown in Table 3. If the list size is set to zero, no data shall be transferred. Bytes shall be transferred in hexadecimal values. 7.2.4 Read Media Error Data (RDMED) The RIMED command shall be used to request the optical disk device to transfer the contents of a sector to the host. The data transferred to the host shall include the following:
User data bytes;
ECC bytes:
Defect Management Pointer (DMP) bytes:
GB/T19729—2005/ISO12142:2001-Any other bytes that are part of the sector data field and bytes that can be corrected by ECC. These bytes shall be sent to the host in the order in which they appear in the medium according to any existing relevant international standards for the medium (e.g., in TSO/IEC10089, for format A media, the byte categories shall be data, DMP, CRC, and ECC, see ISO/IEC10089:1991, Annex G). These bytes shall be expressed in hexadecimal values. The data most recently written to the accessed sector shall be read from the medium and sent to the host. RDMED ADDR BXFER 『CORRON1T
Where,
AI)R is the logical or physical address of the area, which should be expressed as the number of tracks and sectors (expressed in hexadecimal values) for transmission; BXFER is the number of bytes (expressed in hexadecimal values) that should be read by the optical device and transmitted to the host; CORR is the data corrected by ECC. The default value should set ECC correction to ON. -ON: The data is corrected by ECC before being transmitted to the host: -OFF causes the data to be transmitted to the host without correction. 7.2.5 Read Log Data (Read Eog Data, RLD) The RLD command should be used to request the optical device to report log data to the host. Each parameter contained in the command represents a different flag.
The log should be returned to the host in the order in which the log parameters were transmitted to the optical device. RLD ↑ MEI [ CLRMEL ON1T[CMELLIEVCMELL]1
MEL is the Media Error Log: it provides detailed information about different media error identifiers. The data in MEL shall be sent to the host in the order defined in Chapter 8 and Table 22. The order is that the first data sent is the reread count, then the rewrite count, and so on. Each parameter shall be 6 bytes long, the same as the parameter length specified in 8.12.3.2 and Table 21. Parameters shall be transmitted as hexadecimal values.
CLRMEL specifies the clearing of MEL during read operations. The default value shall be UFF. -ON: MEL shall be cleared during readt
OFF: MEI shall not be cleared during read.
CMEIL is the pre-sound media error level log; it reports the currently set media error level values. These values ​​shall be used by the optical disk device to reallocate sectors. Table 4 gives the four defined media error level parameters. The media error levels shall be sent to the host in the order listed in Table 4. Each parameter shall be 6 bytes long. This length is the same as that given for the same parameter definition in 8.12.2.1 and Table 18. The parameters shall be transmitted as hexadecimal values. Table 4 Media Error Levels
Maximum number of error bytes per sector per coding error bytes per sector
Number of bad addends
Number of lost resyncs
If the media does not use resync, this level is N/A and the parameter shall be FFh. If the WR or RE parameter of the DMEFP command is ON, the optical disk device shall reallocate sectors with an error recovery level exceeding one or more media error level values ​​as specified in Table 4. VCMEI.I. is the verification current media error level log; it reports the current verification level value. These levels shall be used to enable the optical disk device to promptly warn the host that the correction level exceeds the relevant level value defined in Table 5. The sector that caused the early warning can be found through MEL. Table 5 lists the four verification error level parameters. The data in VCMELL shall be sent to the host in the order given in Table 3. Each parameter shall be 6 bytes long. This is the same as the parameter length given for the same parameter in 8.12.2.2 and Table 19. Parameters shall be transmitted as hexadecimal values. Verify maximum number of error bytes per coded word in sector Verify number of error bytes per sector
Verify number of bad IIs
Verify number of lost resyncs"
Table 5 Verify media error levels
If the media does not use resync, this level is N/A, and the parameter shall be FFh. 7.2.6 Set Media Error Levels (SMEL) KAoNrKAca
GE/T 19729—2005/ISO 12142:2001 When performing error recovery, the optical disk device should use the SMEI. command to set the media error level and perform error recovery accordingly. Table 4 lists the four media error levels that can be set using this command. The media error levels are the same as those reported by CMELL using the RLD command. The media error levels should be used to reallocate sectors. If the ECC correction level exceeds one or more level values ​​and the parameter WR or RE of the DMERP command is in the ON state, the sector should be reallocated to a free sector. If the parameter WR or RF of the DMERP command is in the OFF state, the optical disk device should not reallocate sectors. In both cases, the optical disk device should report that a level value has been exceeded, verify the level value, and indicate whether the data has been recovered. SMFI [FCW -- nIJI.BFS- n2[1.ID-- n3L1.MRS-- n4] Where 1 to 4 are the following given level values ​​(expressed in hexadecimal values): -LBECW: Maximum error byte count level per sector per codeword, LBES: Error byte count level per sector, IID: Bad ID number level:
-LMRS: Lost Reset Level.
7.2.7 Set Verify Media Error Levels.When the SVMEL (SVMEL) optical disk device performs error recovery, it should use the SMEL command to set the verification media error level and perform error recovery accordingly: Table 5 lists the four verification media error levels that can be set using this command. The verification media error levels are the same as those reported by VCMELL using the RLI (RLI) command.
When the error level value set using this command is exceeded, these level values ​​should be used to obtain media error alarms in advance. The optical disk device should report that a set of water values ​​has been exceeded, verify the level value, and indicate whether the data has been recovered. SVMEL VLBECW-n1 1VLBES=n2 VLID..- n3 VIMRS-- n4 Where n1 to n4 are the level values ​​given as follows (expressed in hexadecimal values): VI.BFCW: Verify the maximum number of error bytes per sector per code level; VLBES. Verify the number of error bytes per sector level: -VI.JD Verify the number of bad IDs level;
-VLMRS. Verify the lost re-step level. 8 SCSI-2 Level Technology
The purpose of this clause is to provide for the use of a selected set of SCSI-2 commands. Selected commands from the SCSI-2 command set can be used to retrieve media error information based on system requirements. In this standard, a selected set of SCSI-2 commands from the SCSI-2 command set are used. This practice is only relevant to media error information and needs to be used in conjunction with ISO/IEC 9316. Some SCSI-2 commands that are described in ISO/IEC 9316 are also included here: however, ISO/IEC 9316 is referenced for the use of SCSI-2 command strategies, not for media error monitoring and reporting. The requirements for media error monitoring and reporting are described in clauses 8.2 to 8.11. These requirements define information about the use of better media error monitoring and reporting methods, and also provide more information on how to meet system requirements by using this standard. The media error monitoring and reporting requirements described in the implementation of each command supersede the implementation requirements given in ISO/IEC9316:1995. Any commands, options or tools not included in this standard shall follow the description in ISO/IEC9316:1995. It is the user's responsibility to request the target device to provide the information provided by the commands described in this chapter. The FORMATUNIT command should be used to format the media. This command can be used as an option to allow the user to verify the media and establish a verification list. This verification list can be retrieved as part of the information obtained by the READDEFECTDATA command (see 8.2 and 8.7). The LOCSELECT command should be used to clear the MEIL described in this standard, which provides information about different media error indicators (see 8.3 and 8.12.3.3).
LOGSENSE command shall be used to retrieve MEL (see 8.4 and 8.12.3.3). The Optical Device Read and Write Error Recovery Page and the Optical Device Verify Error Recovery Page shall be used by the device/system manufacturer as specified in this standard, or the user shall declare EXTENDED to avoid this standard (see 8.12.2). The MODESELECT command and the Optical Device Read Error Recovery Page shall be used to establish media error levels different from the drive device defaults (see 8.5 and 8.12.2). When automatic reallocation is set, the Optical Device shall reallocate sectors that exceed the reallocation criteria defined in Table 4 using the set media error level value set. The MODESELECT command and the Optical Device Verify Error Recovery Page shall be used to establish new verify media error level values ​​(see 8.5 and 8.12.2). The set verify media error level value set shall be used by the Optical Device to warn that the optical disc has one or more verify media error levels that exceed the defined verify media error levels defined in Table 5. The MODESENSE command shall be used to retrieve from the device the media error level in the read/write error recovery page of the optical device and the verified media error level in the verification error recovery frame of the optical device, both as specified in this standard (see 8.6 or 8.12.2). The RFADDEFFCTDATA command shall be used to retrieve information about bad sectors and sectors that have been reallocated (see 8.7). The ILONG command shall be used to retrieve the corrected or uncorrected contents of a sector, including user data, EEC and other sector bytes (see 8.8). This command may also be used to determine the media defect length (see 8.8.2.2). The REQUEST SENSE command shall be used to transmit self-test data to the requestor (see 8.9). The command nest selected from SCS1-2 included in this standard is listed in Table 6. 6 SCSI-2 Command Selection
SCSI-2 Command
FORMATUNIT (Format Unit)
LOG SELECT (Log Select)
LOG SENSF (Log Self-Test)
MODESELECT (Mode Select)
MODE SENSE (Mode SENSE)
READDEFECTDATA (Read Defect Data)
READLONG (Read Full Length)
RFQUFSTSFNSE (Request Self-Test)
VERIFY (Verify)
WRITE AND VERITY (Write and Verify)
8.2 FORMATUNIT Command 8.2.1 Introduction
Rewritable media
Writable media/read-only media
The use of the format unit command is specified in 9.2.1 of ISO/IEC 9316:1995. This information shall be considered part of this standard.
8.2.2 Media error monitoring and reporting requirements
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GB/T19729—2005/IS012142.2001 Before using the format unit command, the optical disc shall be inspected and reasonable precautions shall be taken to ensure that the optical disc is clean and free of contamination. If the optical disc is not clean or free of contamination, it shall be cleaned using the procedures recommended by the media supplier. When the optical disc is formatted, the unclean surface will affect the sectors that can normally be reallocated. The original manufacturer of the media or the device may not be able to authenticate the media. If the media is not authenticated, the optical disc should be formatted in the verification ON state before using the media error monitoring and reporting technology. Formatting in the Verify OV state will generate a defect list and provide baseline information useful for media error monitoring. Table 7 provides the results of executing the READDEFECTDATA command. The abbreviation PDL stands for Primary Defect List and SDL is an abbreviation for Tertiary Defect List. The FDL and SDL, as well as the Plist and Glist bits, are defined in the READ DEFECTDATA command in ISO/IEC 9316 (see 9.2.8 of ISO/IEC 9316:1995). Table 7 Results of using the READDEFECTDATA command Plist bi
Gist bit
Transmission structure
Defined by the SDL followed by the PDL
If it exists
For WORM media and devices, there may be a Working Defect List (WDI): See 8.7 (for the full description of the REAIDEFECFDATA command) and Table 10 Defect Descriptor Format (Wt). It is recommended that the READDEFECTDATA command be executed with the Glist and Plist bits ON immediately after the media has been identified. When the SLIL and PDL are present on the media, they are part of the disc definition structure defined by the media standard listed in the referenced document. In the case of alternative structures (such as other defect management indicators or sector maps), the data transferred to the initialization program when the READ DEFECTDATA command is used with the Glist bit ON should be a list of reallocated and replacement sectors sent to the host in SD1-format (8.7 and Table 9). It is recommended that MODESEI be set before executing the FORMATLNIT command.ECT parameters. Otherwise, the values ​​recorded on the medium will be used. If these values ​​are not on the medium, the optical disk device default values ​​will be used (for mode selection numbers, see the manufacturer's SS2 cabinet optical disk device programming manual).
The defect descriptor shall be returned in block format or physical format. The parameters shall be expressed as hexadecimal values. The index format bytes in Tables 112 to 114 of IS0/IEC9316:1995 are not applicable to this standard. For the implementation of this standard, bytes 0 to 2 in Table 115 of IS0/IEC9316:1995 shall contain the parameter "defective track number\ (the track where the defect occurred)" instead of the "defective cylinder number\ parameter specified in IS0/IEC9316:1995. The parameters shall be expressed as hexadecimal values.
8.3 LOG SELECT (LOG SFLFCT) Command 8.3. 1 Introduction
The use of the LOGSELECT command is specified in 8.2.6 of ISO/IEC:9316:1995 and this information shall be considered part of this standard.
8.3.2 Media Error Monitoring and Reporting Requirements
The OG SELECT command shall be used to clear the MEL page (see 8.12.3 and 8.12.32). The MEL page provides information about the various media error indicators. Three methods of clearing the MEL page are specified. a) The first method is to use the IUGSELECT command with the clear MEI. page (see Table 23). When a target device receives this information, it clears the MEI. True. The page number of the clean MEI. page shall be 3Ah for SCSI 2 devices and 0Ah for SCSI 3 devices, as shown in Table 20.
b) The second method is to use the LO;SELECT command with the reset parameter code (PCR) bit set to 1 and the parameter list length set to 0 (see 1S0)/1EC9316:1995 8.2.6). No page shall be sent to the target device. All
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