Fujitsu MBA3073NC Product Manual - Page 46

Alternate block allocation by FORMAT UNIT command

Get Fujitsu MBA3073NC - Enterprise 73.5 GB Hard Drive PDF manuals and user guides View all Fujitsu MBA3073NC manuals
Add to My Manuals
Save this manual to your list of manuals

Page 46 highlights

: n represents a logical data block number : Defective sector : Unused spare sector Figure 3.7 Alternate block allocation by FORMAT UNIT command During FORMAT UNIT command, alternate block allocation is conducted in following cases: 1) Unrecovered write offtrack condition during a media write 2) Uncorrectable Data Error during a media read (certification) *1 If above errors are detected during FORMAT UNIT command, the HDD allocates the alternate block(s) to the defective data blocks. Reassign procedure itself is the same as one in REASSIGN BLOCKS command. *1. Certification is permitted when DCRT flag is cleared (DCRT flag=0) in FORMAT UNIT command. The HDD checks all initialized logical data blocks by reading them out after the above alternate block allocation is made to initialize (format) the disk. 42 Downloaded from www.Manualslib.com manuals search engine C141-E270

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
:
n represents a logical data block number
:
Defective sector
:
Unused spare sector
Figure 3.7
Alternate block allocation by FORMAT UNIT command
During FORMAT UNIT command, alternate block allocation is conducted in following cases:
1)
Unrecovered write offtrack condition during a media write
2)
Uncorrectable Data Error during a media read (certification) *1
If above errors are detected during FORMAT UNIT command, the HDD allocates the alternate
block(s) to the defective data blocks. Reassign procedure itself is the same as one in REASSIGN
BLOCKS command.
*1. Certification is permitted when DCRT flag is cleared (DCRT flag=0) in FORMAT UNIT
command.
The HDD checks all initialized logical data blocks by reading them out after the above
alternate block allocation is made to initialize (format) the disk.
42
C141-E270
Downloaded from
www.Manualslib.com
manuals search engine