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Alternate block allocation by FORMAT UNIT command, Unused spare sector

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: n represents a logical data block number : Defective sector : Unused spare sector Figure 3.7 Alternate block allocation by FORMAT UNIT command If the data block verifying operation (certification) is not permitted (DCRT flag = 0) in the FORMAT UNIT command, the IDD checks all initialized logical data blocks by reading them out after the above alternate block allocation is made to initialize (format) the disk. If a defective data block is detected during the check, the IDD allocates the alternate block to the defective data block. This alternate block allocation is made by means of alternate sector treatment only like processing by the REASSIGN BLOCKS command even if unused spare sectors exists in the same cell. C141-E166 3-13

Section	Page
Front Cover	1
FOR SAFE OPERATION	2
REVISION RECORD	3
PREFACE	5
Important Alert Items	7
CONTENTS	11
FIGURES	15
TABLES	17
CHAPTER 1 GENERAL DESCRIPTION	19
1.1 Standard Features	20
1.2 Hardware Structure	24
1.3 System Configuration	27
CHAPTER 2 SPECIFICATIONS	29
2.1 Hardware Specifications	29
2.1.1 Model name and order number	29
2.1.2 Function specifications	30
2.1.3 Environmental specifications	32
2.1.4 Error rate	33
2.1.5 Reliability	33
2.2 SCSI Function Specifications	35
CHAPTER 3 DATA FORMAT	37
3.1 Data Space	37
3.1.1 Cylinder configuration	37
3.1.2 Alternate spare area	40
3.1.3 Track format	41
3.1.4 Sector format	43
3.1.5 Format capacity	45
3.2 Logical Data Block Addressing	45
3.3 Defect Management	47
3.3.1 Defect list	47
3.3.2 Alternate block allocation	47
CHAPTER 4 INSTALLATION REQUIREMENTS	53
4.1 Mounting Requirements	53
4.1.1 External dimensions	53
4.1.2 Mounting	56
4.1.3 Notes on mounting	56
4.2 Power Supply Requirements	60
4.3 Connection Requirements	63
4.3.1 68 pin connector 16-bit SCSI model (NP model)	63
4.3.2 SCA2 type SCSI model (NC model)	71
4.3.3 Cable connector requirements	72
4.3.4 External operator panel (on NP model drives only)	74
CHAPTER 5 INSTALLATION	75
5.1 Notes on Handling Drives	75
5.2 Connections	77
5.3 Setting Terminals	79
5.3.1 SCSI ID setting (NP model only)	80
5.3.2 Each mode setting (NP model only)	81
5.3.3 Mode settings	83
5.4 Mounting D ives	84
5.4.1 Check before mounting	84
5.4.2 Mounting p ocedures	84
5.5 Connecting Cables	85
5.6 Confirming Operations after Installation and Preparation for use	86
5.6.1 Confirming initial operations	86
5.6.2 Checking SCSI connection	87
5.6.3 Formatting	90
5.6.4 Setting parameters	92
5.7 Dismounting Drives	96
5.8 Spare Disk Drive	96
CHAPTER 6 DIAGNOSTICS AND MAI TENANCE	97
6.1 Diagnostics	97
6.1.1 Self-diagnostics	97
6.1.2 Test programs	100
6.2 Maintenance Information	101
6.2.1 Precautions	101
6.2.2 Maintenance requirements	102
6.2.3 Maintenance levels	104
6.2.4 Revision numbers	105
6.2.5 Tools and test equipment	106
6.2.6 Tests	106
6.3 Operation Check	108
6.3.1 Initial seek operation check	108
6.3.2 Operation test	108
6.3.3 Diagnostic test	108
6.4 Troubleshooting Procedures	109
6.4.1 Outline of troubleshooting procedures	109
6.4.2 Troubleshooting with disk drive replacement in the field	109
6.4.3Troubleshooting at the repair site	111
6.4.4 Troubleshooting with parts replacement in the factory	112
6.4.5 Finding possibly faulty parts	112
CHAPTER 7 ERROR ANALYSIS	113
7.1 Error Analysis Information Collection	113
7.1.1 Sense data	113
7.1.2 Sense key,sense code,and subsense code	113
7.2 Sense Data Analysis	115
7.2.1 Error information indicated with sense data	115
7.2.2 Sense data (3-0C-03),(4-40-xx),(4-44-xx),and (4-C4-xx)	116
7.2.3 Sense data (1-1x-xx),(3-1x-xx)and (E-1D-00):Disk read error	116
7.2.4 Sense data (5-2x-xx),(5-3D-00),(5-90-00),(B-47-xx),(B-49-00),(B-4D-xx)and (B-4E-00): SCSI interface error	116
APPENDIX A SETTING TERMINALS	117
A.1 Setting Terminals (on NP model only)	118
APPENDIX B CONNECTOR SIGNAL ALLOCATION	119
B.1 SCSI Connector Signal Allocation:68 pin type LVD 16-bit SCSI	120
B.2 SCSI Connector Signal Allocation:SCA2 type LVD 16-bit SCSI	121
INDEX	123
Addresses	127
Reader Comment Form	129

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C141-E166

3-13

Figure 3.7

Alternate block allocation by FORMAT UNIT command

If the data block verifying operation (certification) is not permitted (DCRT flag = 0) in the

FORMAT UNIT command, the IDD checks all initialized logical data blocks by reading them out

after the above alternate block allocation is made to initialize (format) the disk.

If a defective data

block is detected during the check, the IDD allocates the alternate block to the defective data

block.

This alternate block allocation is made by means of alternate sector treatment only like

processing by the REASSIGN BLOCKS command even if unused spare sectors exists in the same

cell.

Unused spare sector

Defective sector

n represents a logical data block number