IBM IC25N040ATCS04 Hard Drive Specifications - Page 28

Mechanical positioning, 4.2.1 Average seek time including settling, 4.2.2 Full stroke seek - 0 problem

Get IBM IC25N040ATCS04 - Travelstar 40 GB Hard Drive PDF manuals and user guides View all IBM IC25N040ATCS04 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 28 highlights

4.4.2 Mechanical positioning 4.4.2.1 Average seek time (including settling) Command Type Read Write Typical (ms) 12 14 Max. (ms) 16 17 Figure 9. Mechanical positioning performance Typical and Max. are defined throughout the performance specification as follows: Typical Max. Average of the drive population tested at nominal environmental and voltage conditions. Maximum value measured on any one drive over the full range of the environmental and voltage conditions. (See section 6.1, "Environment" on page 23 and section 6.2, "DC power requirements" on page 25) The seek time is measured from the start of motion of the actuator to the start of a reliable read or write operation. A reliable read or write operation implies that error correction/recovery is not employed to correct arrival problems. The Average Seek Time is measured as the weighted average of all possible seek combinations. max. Σ (max. + 1 - n)(Tnin + Tnout) n=1 Weighted Average max. + 1)(max) Where: max. n Tnin Tnout = maximum seek length = seek length (1-to-max.) = inward measured seek time for an n-track seek = outward measured seek time for an n-track seek 4.4.2.2 Full stroke seek Command Type Read Write Typical (ms) 23.0 24.0 Max. (ms) 30.0 31.0 Figure 10. Full stroke seek time Full stroke seek time in milliseconds is the average time of 1000 full stroke seeks. Travelstar 60GH & 40GN hard disk drive specifications 15

  • 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
  • 212
  • 213
  • 214
  • 215
  • 216
  • 217
4.4.2 Mechanical positioning
4.4.2.1 Average seek time (including settling)
17
14
Write
16
12
Read
Max. (ms)
Typical (ms)
Command
Type
Figure 9. Mechanical positioning performance
Typical and Max. are defined throughout the performance specification as follows:
Maximum value measured on any one drive over the full range of the environmental and
voltage
conditions. (See section 6.1, "Environment" on page 23 and section 6.2, "DC power
requirements" on page 25)
Max.
Average of the drive population tested at nominal environmental and voltage conditions.
Typical
The seek time is measured from the start of motion of the actuator to the start of a reliable read or write
operation. A reliable read or write operation implies that error correction/recovery is not employed to cor-
rect arrival problems. The Average Seek Time is measured as the weighted average of all possible seek
combinations.
max.
Σ
(max. + 1 – n)(Tn
in
+ Tn
out
)
n=1
Weighted Average = ––––––––––––––––––––––––––––
(max. + 1)(max)
Where: max.
= maximum seek length
n
= seek length (1-to-max.)
Tn
in
= inward measured seek time for an n-track seek
Tn
out
= outward measured seek time for an n-track seek
4.4.2.2 Full stroke seek
31.0
24.0
Write
30.0
23.0
Read
Max. (ms)
Typical (ms)
Command
Type
Figure 10. Full stroke seek time
Full stroke seek time in milliseconds is the average time of 1000 full stroke seeks.
Travelstar 60GH & 40GN hard disk drive specifications
15