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Track skew/cylinder skew

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(2) Track skew and cylinder skew To avoid waiting for one turn involved in head and cylinder switching, the first logical data block in each track is shifted by the number of sectors (track skew and cylinder skew) corresponding to the switching time. Figure 3.5 shows how the data block is allocated in each track. At the head switching location in a cylinder, the first logical data block in track t + 1 is allocated at the sector position which locates the track skew behind the sector position of the last logical data block sector in track t. At the cylinder switching location, like the head switching location, the first logical data block in a cylinder is allocated at the sector position which locates the cylinder skew behind the last logical sector position in the preceding cylinder. The last logical sector in the cylinder is allocated when formatting, and is an unused spare sector. Figure 3.5 Track skew/cylinder skew The number of physical sectors (track skew factor and cylinder skew factor) corresponding to the skew time varies depending on the logical data block length because the track skew and the cylinder skew are managed for individual sectors. The IDD automatically determines appropriate values for the track skew factor and the cylinder skew factor according to the specified logical data block length. The value can be read out by the MODE SENSE or MODE SENSE EXTENDED command after the track has been formatted. C141-E103-02EN 3 - 7

Section	Page
COVER	1
REVISION RECORD	2
PREFACE	6
Important Alert Items	9
MANUAL ORGANIZATION	11
CONTENTS	12
FIGURES	16
TABLES	18
CHAPTER 1 GENERAL DESCRIPTION	20
1.1 Standard Features	21
1.2 Hardware Structure	24
1.3 System Configuration	28
CHAPTER 2 SPECIFICATIONS	30
2.1 Hardware Specifications	30
2.1.1 Model name and part number	30
2.1.2 Function specifications	31
2.1.3 Environmental specifications	33
2.1.4 Error rate	34
2.1.5 Reliability	34
2.2 SCSI Function Specifications	36
CHAPTER 3 DATA FORMAT	38
3.1 Data Space	38
3.1.1 Cylinder configuration	38
3.1.2 Alternate spare area	42
3.1.3 Track format	43
3.1.4 Sector format	45
3.1.5 Format capacity	47
3.2 Logical Data Block Addressing	48
3.3 Defect Management	49
3.3.1 Defect list	49
3.3.2 Alternate block allocation	49
CHAPTER 4 INSTALLATION REQUIREMENTS	54
4.1 Mounting Requirements	54
4.1.1 External dimensions	54
4.1.2 Mounting	59
4.1.3 Notes on mounting	59
4.2 Power Supply Requirements	64
4.3 Connection Requirements	67
4.3.1 68 pin connector 16-bit SCSI model (MP model)	67
4.3.2 SCA2 type SCSI model (MC model)	75
4.3.3 Cable connector requirements	79
4.3.4 External operator panel	80
CHAPTER 5 INSTALLATION	82
5.1 Notes on Handling Drives	82
5.2 Connections	84
5.3 Setting Terminals	86
5.3.1 SCSI ID setting	87
5.3.2 Each mode setting	88
5.3.3 Mode settings	90
5.4 Mounting Drives	91
5.4.1 Check before mounting	91
5.4.2 Mounting procedures	91
5.5 Connecting Cables	92
5.6 Confirming Operations after Installation and Preparation for use	93
5.6.1 Confirming initial operations	93
5.6.2 Checking SCSI connection	94
5.6.3 Formatting	97
5.6.4 Setting parameters	99
5.7 Dismounting Drives	103
5.8 Spare Disk Drive	103
CHAPTER 6 DIAGNOSTICS AND MAINTENANCE	104
6.1 Diagnostics	104
6.1.1 Self-diagnostics	104
6.1.2 Test programs	107
6.2 Maintenance Information	108
6.2.1 Precautions	108
6.2.2 Maintenance requirements	109
6.2.3 Maintenance levels	111
6.2.4 Revision numbers	112
6.2.5 Tools and test equipment	113
6.2.6 Tests	113
6.3 Operation Check	115
6.3.1 Initial seek operation check	115
6.3.2 Operation test	115
6.3.3 Diagnostic test	115
6.4 Troubleshooting Procedures	116
6.4.1 Outline of troubleshooting procedures	116
6.4.2 Troubleshooting with disk drive replacement in the field	116
6.4.3 Troubleshooting at the repair site	118
6.4.4 Troubleshooting with parts replacement in the factory	119
6.4.5 Finding possibly faulty parts	119
CHAPTER 7 ERROR ANALYSIS	120
7.1 Error Analysis Information Collection	120
7.1.1 Sense data	120
7.1.2 Sense key, sense code, and subsense code	120
7.2 Sense Data Analysis	122
7.2.1 Error information indicated with sense data	122
7.2.2 Sense data (4-03-xx), (4-40-xx), (4-44-xx), and (4-C4-xx)	123
7.2.3 Sense data (1-1x-xx), (3-1x-xx) and (E-1D-00): Disk read error	123
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	123
CHAPTER 8 PRINCIPLE OF OPERATION	124
8.1 Outline	124
8.2 Disk Drive Configuration	124
8.2.1 Disks	125
8.2.2 Heads	125
8.2.3 Spindle mechanism	125
8.2.4 Actuator	125
8.2.5 Air filters	125
8.3 Circuit Configuration	126
8.4 Power-On Sequence	128
8.5 Factory-Calibration	129
8.6 Read/Write Circuit	129
8.6.1 Head IC	129
8.6.2 Write circuit	130
8.6.3 Read circuit	131
8.7 Servo Control	133
8.7.1 Servo control circuit	133
8.7.2 Servo format	134
8.7.3 Servo frame format	136
8.7.4 Spindle motor control	136
8.7.5 Voice coil motor control	136
APPENDIX A LOCATIONS OF CONNECTORS AND SETTING TERMINALS	138
A.1 Locations of Connectors and Setting Terminals (MAH series MC model)	139
A.2 Locations of Connectors and Setting Terminals (MAH series MP model)	140
A.3 Locations of Connectors and Setting Terminals (MAJ series MC model)	141
A.4 Locations of Connectors and Setting Terminals (MAJ series MP model)	142
APPENDIX B SETTING TERMINALS	144
B.1 Setting Terminals	145
APPENDIX C CONNECTOR SIGNAL ALLOCATION	148
C.1 SCSI Connector Signal Allocation: SCA2 type LVD 16-bit SCSI	149
C.2 SCSI Connector Signal Allocation: 68 pin type LVD 16-bit SCSI	150
APPENDIX D MODEL NAMES AND PRODUCT NUMBERS	152
D.1 Model Names and Product Numbers	153
ADDRESSES	154

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C141-E103-02EN

3 - 7

(2)

Track skew and cylinder skew

To avoid waiting for one turn involved in head and cylinder switching, the first logical data block

in each track is shifted by the number of sectors (track skew and cylinder skew) corresponding to

the switching time.

Figure 3.5 shows how the data block is allocated in each track.

At the head switching location in a cylinder, the first logical data block in track t + 1 is allocated at

the sector position which locates the track skew behind the sector position of the last logical data

block sector in track t.

At the cylinder switching location, like the head switching location, the first logical data block in a

cylinder is allocated at the sector position which locates the cylinder skew behind the last logical

sector position in the preceding cylinder.

The last logical sector in the cylinder is allocated when

formatting, and is an unused spare sector.

Figure 3.5

Track skew/cylinder skew

The number of physical sectors (track skew factor and cylinder skew factor) corresponding to the

skew time varies depending on the logical data block length because the track skew and the

cylinder skew are managed for individual sectors.

The IDD automatically determines appropriate

values for the track skew factor and the cylinder skew factor according to the specified logical data

block length.

The value can be read out by the MODE SENSE or MODE SENSE EXTENDED

command after the track has been formatted.