Hitachi ic35l060avv207-0 Specifications - Page 27

Full stroke seek, without command overhead, including settling, 4.2.3, Head switch time Head - problem

Get Hitachi ic35l060avv207-0 - Deskstar 60 GB Hard Drive PDF manuals and user guides View all Hitachi ic35l060avv207-0 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 27 highlights

The terms "Typical" and "Max" are used throughout this specification with the following meanings: Typical. The average of the drive population tested at nominal environmental and voltage conditions. Max. The maximum value measured on any one drive over the full range of the environmental and voltage conditions. (See Section 6.4, "Environment" on page 45 and Section 6.5, "DC Power Requirements" on page 47. Seek time is measured from the start of the motion of the actuator to the start of a reliable read or write operation. "Reliable read or write" implies that error correction/recovery is not used 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) (Tnin + Tnout) 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 (without command overhead, including settling) Function Read (80 GB - 180 GB models) Read (30 GB & 60 GB models) Write (80 GB - 180 GB models) Write (30 GB & 60 GB models) Read (Quiet Seek mode) Write (Quiet Seek mode) Typical (ms) 14.7 15.1 15.7 16.1 32.5 33.5 Max (ms) 17.7 18.1 18.7 19.1 35.5 36.5 Figure 6. Full stroke seek time Full stroke seek is measured as the average of 1000 full stroke seeks with a random head switch from both directions (inward and outward). 4.4.2.3 Head switch time (Head skew) 72 kTPI Head switch time - typical (ms) 1.4 Figure 7. Head switch time Head switch time is defined as the amount of time required by the fixed disk to complete a seek of the next sequential track after reading the last sector in the current track The measuring method is given in 4.4.5 "Throughput" on page 16. Deskstar 180GXP hard disk drive specifications 13

  • 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
  • 218
  • 219
  • 220
  • 221
  • 222
  • 223
  • 224
  • 225
  • 226
  • 227
  • 228
  • 229
  • 230
  • 231
  • 232
  • 233
  • 234
  • 235
  • 236
  • 237
  • 238
  • 239
  • 240
  • 241
  • 242
  • 243
  • 244
  • 245
  • 246
  • 247
The terms “Typical” and “Max” are used throughout this specification with the following meanings:
Typical.
The average of the drive population tested at nominal environmental and voltage con-
ditions.
Max.
The
maximum value measured on any one drive over the full range of the environmental
and voltage conditions. (See
Section
6.4, “Environment” on page 45 and Section 6.5, “DC
Power Requirements” on page 47.
Seek time is measured from the start of the motion of the actuator to the start of
a reliable read or write
operation.
"Reliable read or write" implies that error correction/recovery is not used to correct arrival pro-
blems.
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) (Tn
in
+ Tn
out
)
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
(without command overhead, including settling)
36.5
33.5
Write (Quiet Seek mode)
35.5
32.5
Read (Quiet Seek mode)
19.1
16.1
Write (30 GB & 60 GB models)
18.7
15.7
Write (80 GB – 180 GB models)
18.1
15.1
Read (30 GB & 60 GB models)
17.7
14.7
Read (80 GB – 180 GB models)
Max
(ms)
Typical
(ms)
Function
Figure 6. Full stroke seek time
Full stroke seek is measured as the average of 1000 full stroke seeks with a
random head switch
from
both directions (inward and outward).
4.4.2.3
Head switch time (Head skew)
1.4
72 kTPI
Head switch time - typical
(ms)
Figure 7. Head switch time
Head switch time is defined as the amount of time required by the fixed disk to complete a seek of the
next sequential track after reading the last sector in the current track
The measuring method is given in 4.4.5 “Throughput” on page 16.
Deskstar 180GXP hard disk drive specifications
13