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Write And Verify

UPC - 550221511118

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5.3 Disk Drive Error Recovery Processing Remark: 1. When this function is specified (ARRE = "1"), the EER flag's specification in the MODE SELECT parameter is made invalid and Read retry processing is performed up to the number of times specified in the "Number of Retries during Read" parameter. If "0" is specified in the DCR flag, correction processing of the data is performed afterward (see Section 5.3.1 (3)). When "1" is specified in the DCR flag, ECC correction processing is prohibited, so even if "1" is specified in the ARRE flag, auto alternate block allocation processing will not be executed for errors in the data area. 2. When errors in the data area are recovered from by ECC correction processing, before implementing alternate block allocation processing, rewriting of the recovered data and a verify check (rereading) are performed. If data are recovered by rewriting, alternate block allocation of that data block is not performed. 3. When a write operation is prohibited through the setting terminal, the auto alternate block allocation processing specification is disabled. (2) Auto alternate block allocation processing during a write operation 1 This function is enabled by specifying "1" in the AWRE flag in the MODE SELECT parameters. Furthermore, this function is applicable to the following commands only. • WRITE command • WRITE EXTENDED command • WRITE AND VERIFY If a WRITE command has the same LBA in the log, then data will be written to the sector, and it will be verified. If the verify is successful, then the AWRE will not be performed. (no sense will be reported). If the verify is unsuccessful, then check the spare. Write the data onto the new spare, and verify it. If the verify is successful, then the reallocation will be proceeded. If the verify is unsuccessful, then the drive will add the defective spare onto the G-List, and then its conversion process will be interrupted. After reallocates all of the logged LBA included in a WRITE command the drive will start the write operation. (3) Auto alternate block allocation processing during a write operation 2 This function is enabled by specifying "1" in the AWRE flag in the MODE SELECT parameters. Furthermore, this function is applicable to the following commands only. • WRITE command • WRITE EXTENDED command • WRITE AND VERIFY When this function is permitted, if, during WRITE/WRITE EXTENDED command detects any Servo error (e.g. Write offtrack error) and cannot be recovered within pre-determined retry number (specified in Mode Parameter). For the sectors around defective Servo, alternate blocks are allocated and the data of this WRITE commands are re-written. C141-C010 5-25

Section	Page
Front Cover	1
FOR SAFE OPERATION	2
Revision History	3
Preface	5
Contents	11
Illustrations	16
Figures	16
Tables	17
CHAPTER 1 Command Processing	19
1.1 Command Format	19
1.2 Status	24
1.3 Outline of Command Processing	26
1.3.1 Single commands	26
1.3.2 Command link	27
1.3.3 Disconnect/reconnect processing	29
1.3.4 Synchronous mode data transfer/wide mode data transfer	33
1.4 Command Queuing Function	34
1.4.1 Untagged queuing	34
1.4.2 Tagged queuing	36
1.5 UNIT ATTENTION Condition	37
1.5.1 Generation of the UNIT ATTENTION condition	37
1.5.2 Response and release condition at UNIT ATTENTION condition hold state	38
1.5.3 UNIT ATTENTION condition multiple hold	38
1.6 Sense Data Hold State	40
1.6.1 Sense data hold condition	40
1.6.2 Response and release conditions at sense data hold state	40
1.7 Command Processing Exceptions	41
1.7.1 Overlapping commands	41
1.7.2 Illegal LUN specification	42
1.7.3 Reserved operation code	42
1.7.4 Command processing in the not ready state	42
1.7.5 Error recovery processing	44
1.7.6 Reset processing	46
1.7.7 Fatal hardware errors	47
1.8 Data Block Addressing	48
1.8.1 Definition of data space	48
1.8.2 Logical block addressing	50
CHAPTER 2 Data Buffer Management	51
2.1 Data Buffer	51
2.1.1 Data buffer configuration and basic operation	51
2.1.2 Operation mode setting	55
2.2 Look-Ahead Cache Feature	56
2.2.1 Caching operation	56
2.2.2 Caching parameters	59
2.2.3 Look-Ahead operation, Look-Ahead volume	60
2.3 Write Cache	61
CHAPTER 3 Command Specifications	63
3.1 Control/Sense Commands	63
3.1.1 TEST UNIT READY (00)	63
3.1.2 INQUIRY (12)	64
3.1.3 READ CAPACITY (25)	75
3.1.4 CHANGE DEFINITION (40)	76
3.1.5 MODE SELECT (15)	81
3.1.6 MODE SELECT EXTENDED (55)	89
3.1.7 MODE SENSE (1A)	92
3.1.8 MODE SENSE EXTENDED (5A)	100
3.1.9 REZERO UNIT (01)	103
3.1.10 START/STOP UNIT (1B)	103
3.1.11 RESERVE (16)	105
3.1.12 RESERVE EXTENDED (56)	108
3.1.13 RELEASE (17)	109
3.1.14 RELEASE EXTENDED (57)	110
3.1.15 REQUEST SENSE (03)	110
3.1.16 LOG SELECT (4C)	112
3.1.17 LOG SENSE (4D)	116
3.1.18 PERSISTENT RESERVE IN (5E)	117
3.1.19 PERSISTENT RESERVE OUT (5F)	124
3.1.20 REPORT LUNS (A0)	128
3.1.21 REPORT DEVICE IDENTIFIER (A3)	130
3.1.22 SET DEVICE IDENTIFIER (A4)	131
3.2 Data Access Commands	133
3.2.1 READ (08)	133
3.2.2 READ EXTENDED (28)	134
3.2.3 WRITE (0A)	135
3.2.4 WRITE EXTENDED (2A)	136
3.2.5 WRITE AND VERIFY (2E)	137
3.2.6 VERIFY (2F)	138
3.2.7 SEEK (0B)	139
3.2.8 SEEK EXTENDED (2B)	139
3.2.9 SET LIMITS (33) (Not Supported)	140
3.2.10 SYNCHRONIZE CACHE (35)	142
3.3 Format Commands	143
3.3.1 FORMAT UNIT (04)	143
3.3.2 REASSIGN BLOCKS (07)	153
3.3.3 READ DEFECT DATA (37)	156
3.4 Maintenance, Diagnostic Commands	161
3.4.1 SEND DIAGNOSTIC (1D)	161
3.4.2 RECEIVE DIAGNOSTIC RESULTS (1C)	168
3.4.3 WRITE BUFFER (3B)	172
3.4.4 READ BUFFER (3C)	177
3.4.5 READ LONG (3E)	181
3.4.6 WRITE LONG (3F)	182
3.4.7 WRITE SAME (41)	183
CHAPTER 4 Parameter Data Formats	185
4.1 Mode Parameters	185
4.1.1 Read/Write error recovery parameters (page code = 1)	185
4.1.2 Disconnect/reconnect parameters (page code = 2)	194
4.1.3 Format parameter (page code = 3)	198
4.1.4 Drive parameter (page code = 4)	202
4.1.5 Verify error recovery parameters (page code = 7)	203
4.1.6 Caching parameters (page code = 8)	205
4.1.7 Control mode parameters (page code = 0A)	211
4.1.8 Notch parameter (page code = 0C)	215
4.1.9 Port control parameter (page code = 19)	217
4.1.10 Informational exceptions control page (page code = 1C)	227
4.1.11 Background control mode parameter (page code = 1C/subpage = 01)	231
4.1.12 Additional error recovery parameters (page code = 21)	232
4.2 Log Parameters	233
4.2.1 Supprot log page (X'00')	233
4.2.2 Buffer overrun / underrun page (X'01')	234
4.2.3 Write error count page (X'02')	235
4.2.4 Read error count page (X'03')	238
4.2.5 Verify error count page (X'05')	242
4.2.6 Non-medium error count page (X'06')	245
4.2.7 Temperature page (X'0D')	246
4.2.8 Start-stop cycle counter page (X'0E')	247
4.2.9 Application client page (X'0F')	250
4.2.10 Self-test result page (X'10')	251
4.2.11 Background medium scan page (X'15')	253
4.2.12 SMART status page (X'2F')	255
4.2.13 SMART data page (X'38')	256
CHAPTER 5 Sense Data Error Recovery Methods	257
5.1 Sense Data	257
5.1.1 Sense data format	257
5.1.2 Sense data basic information	258
5.1.3 Sense data additional information	268
5.2 INIT Error Recovery Methods (Recommended)	268
5.2.1 Termination status analysis and error recovery methods	268
5.2.2 Sense data analysis and error recovery methods	271
5.2.3 Error logging	278
5.3 Disk Drive Error Recovery Processing	279
5.3.1 Error states and retry processing procedures	279
5.3.2 Auto alternate block allocation processing	280
5.3.3 Error recovery processing control	282
CHAPTER 6 Disk Media Management	285
6.1 Defect Management	285
6.2 Disk Media Initialization	287
6.2.1 Initialization during installation	287
6.2.2 Re-initialization	289
6.3 Data Block Verification Methods (Recommended)	290
6.4 Alternate Block Allocation Processing	291
Glossary	293
Acronyms and Abbreviations	297
Index	299
READER’S COMMENT FORM	307

Match case Limit results 1 per page

5.3

Disk Drive Error Recovery Processing

C141-C010

5-25

Remark:

When this function is specified (ARRE = "1"), the EER flag's specification in the MODE

SELECT parameter is made invalid and Read retry processing is performed up to the number of

times specified in the "Number of Retries during Read" parameter.

If "0" is specified in the

DCR flag, correction processing of the data is performed afterward (see Section 5.3.1 (3)).

When "1" is specified in the DCR flag, ECC correction processing is prohibited, so even if "1"

is specified in the ARRE flag, auto alternate block allocation processing will not be executed for

errors in the data area.

When errors in the data area are recovered from by ECC correction processing, before

implementing alternate block allocation processing, rewriting of the recovered data and a verify

check (rereading) are performed.

If data are recovered by rewriting, alternate block allocation

of that data block is not performed.

When a write operation is prohibited through the setting terminal, the auto alternate block

allocation processing specification is disabled.

(2)

Auto alternate block allocation processing during a write operation 1

This function is enabled by specifying "1" in the AWRE flag in the MODE SELECT parameters.

Furthermore, this function is applicable to the following commands only.

•

WRITE command

•

WRITE EXTENDED command

•

WRITE AND VERIFY

If a WRITE command has the same LBA in the log, then data will be written to the sector, and it will be

verified.

If the verify is successful, then the AWRE will not be performed.

(no sense will be reported).

If the verify is unsuccessful, then check the spare.

Write the data onto the new spare, and verify it. If the

verify is successful, then the reallocation will be proceeded. If the verify is unsuccessful, then the drive

will add the defective spare onto the G-List, and then its conversion process will be interrupted.

After

reallocates all of the logged LBA included in a WRITE command the drive will start the write operation.

(3)

Auto alternate block allocation processing during a write operation 2

This function is enabled by specifying "1" in the AWRE flag in the MODE SELECT parameters.

Furthermore, this function is applicable to the following commands only.

•

WRITE command

•

WRITE EXTENDED command

•

WRITE AND VERIFY

When this function is permitted, if, during WRITE/WRITE EXTENDED command detects any Servo

error (e.g. Write offtrack error) and cannot be recovered within pre-determined retry number (specified

in Mode Parameter).

For the sectors around defective Servo, alternate blocks are allocated and the data

of this WRITE commands are re-written.