IBM DJSA-210 Hard Drive Specifications - Page 33

Data integrity, 1 Data loss on power off, 2 Write Cache, 3 Equipment status

Get IBM DJSA-210 - Travelstar 10 GB Hard Drive PDF manuals and user guides View all IBM DJSA-210 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 33 highlights

5.0 Data integrity 5.1 Data loss on power off ! Data loss will not be caused by a power off during any operation but the write operation. ! A power off during a write operation causes the loss of any received or resident data that has not been written onto the disk media. ! A power off during a write operation might make a maximum of one sector of data unreadable. This state can be recovered by a rewrite operation. 5.2 Write Cache When the write cache is enabled the write command may complete before the actual disk write operation finishes. This means that a power off, even after the write command completion, could cause the loss of data that the drive has received but not yet written onto the disk. In order to prevent this data loss, confirm the completion of the actual write operation prior to the power off by issuing a ! Soft reset ! Hard reset ! Flush Cache command ! Standby command ! Standby Immediate command ! Sleep command Confirm the command's completion. 5.3 Equipment status The equipment status is available to the host system any time the drive is not ready to read, write, or seek. This status normally exists at the power-on time and will be maintained until the following conditions are satisfied: ! The access recalibration/tuning is complete. ! The spindle speed meets the requirements for reliable operation. ! The self-check of the drive is complete. The appropriate error status is made available to the host system if any of the following conditions occur after the drive has become ready: ! The spindle speed lies outside the requirements for reliable operation. ! The occurrence of a Write Fault condition. Travelstar 32GH/30GT/20GN hard disk drive specifications 19

  • 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
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
  • 166
  • 167
  • 168
  • 169
  • 170
  • 171
  • 172
  • 173
  • 174
  • 175
  • 176
  • 177
  • 178
  • 179
  • 180
  • 181
  • 182
  • 183
  • 184
  • 185
  • 186
  • 187
  • 188
  • 189
  • 190
  • 191
  • 192
  • 193
  • 194
  • 195
  • 196
  • 197
  • 198
  • 199
  • 200
  • 201
  • 202
  • 203
  • 204
  • 205
  • 206
  • 207
  • 208
  • 209
  • 210
  • 211
5.0 Data integrity
5.1 Data loss on power off
!
Data loss will not be caused by a power off during any operation but the write operation.
!
A power off during a write operation causes the loss of any received or resident data that has not
been written onto the disk media.
!
A power off during a write operation might make a maximum of one sector of data unreadable. This
state can be recovered by a rewrite operation
.
5.2 Write Cache
When the write cache is enabled the write command may complete before the actual disk write operation
finishes. This means that a power off, even after the write command completion, could cause the loss of
data that the drive has received but not yet written onto the disk.
In order to prevent this data loss, confirm the completion of the actual write operation prior to the power off
by issuing a
!
Soft reset
!
Hard reset
!
Flush Cache command
!
Standby command
!
Standby Immediate command
!
Sleep command
Confirm the command’s completion.
5.3 Equipment status
The equipment status is available to the host system any time the drive is not ready to read, write, or seek.
This status normally exists at the power-on time and will be maintained until the following conditions are
satisfied:
!
The access recalibration/tuning is complete.
!
The spindle speed meets the requirements for reliable operation.
!
The self-check of the drive is complete.
The appropriate error status is made available to the host system if any of the following conditions occur
after the drive has become ready:
!
The spindle speed lies outside the requirements for reliable operation.
!
The occurrence of a Write Fault condition.
Travelstar 32GH/30GT/20GN hard disk drive specifications
19