Hitachi HDT725025VLA380 Specifications - Page 75

Vibration and shock

Page 75 highlights

7.6 Vibration and shock All vibration and shock measurements recorded in this section are made with a drive that has no mounting attachments for the systems. The input power for the measurements is applied to the normal drive mounting points. 7.6.1 Operating vibration 7.6.1.1 Random vibration The test is 30 minutes of random vibration using the power spectral density (PSD) levels shown below in each of three mutually perpendicular axes. The disk drive will operate without non-recoverable errors when subjected to the above random vibration levels. Table 43: Random vibration PSD profile break points (operating) Direction x10-3 [G2/Hz] 5Hz 0.02 17Hz 45Hz 48Hz 1.1 1.1 8.0 62Hz 8.0 65Hz 150Hz 200Hz 500Hz 1.0 1.0 0.5 0.5 RMS (G) 0.67 The overall RMS (root mean square) level is 0.67 G. 7.6.1.2 Swept sine vibration The drive will meet the criteria shown below while operating in the specified conditions: • No errors occur with 0.5 G 0 to peak, 5 to 300 to 5 Hz sine wave, 0.5 oct/min sweep rate with 3-minute dwells at two major resonances • No data loss occurs with 1 G 0 to peak, 5 to 300 to 5 Hz sine wave, 0.5 oct/min sweep rate with 3-minute dwells at two major resonances 7.6.2 Nonoperating vibration The drive does not sustain permanent damage or loss of previously recorded data after being subjected to the environment described below 7.6.2.1 Random vibration The test consists of a random vibration applied in each of three mutually perpendicular axes for a duration of 10 minutes per axis. The PSD levels for the test simulate the shipping and relocation environment shown below. Table 44: Random Vibration PSD profile breakpoints (nonoperating) Frequency 2Hz 4Hz G2/Hz 0.001 0.03 8Hz 40Hz 55Hz 0.03 0.003 0.01 70Hz 0.01 200Hz 0.001 The overall RMS (root mean square) level of vibration is 1.04 G. 7.6.2.2 Swept sine vibration • 2 G (zero-to-peak), 5 to 500 to 5 Hz sine wave • 0.5 oct/min sweep rate • 3 minutes dwell at two major resonances Deskstar T7K500 Hard Disk Drive Specification 61

  • 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
  • 248
  • 249
  • 250
  • 251
  • 252
  • 253
  • 254
  • 255
  • 256
  • 257
  • 258
  • 259
  • 260
  • 261
  • 262
  • 263
  • 264
  • 265
  • 266
  • 267
  • 268
  • 269
  • 270
  • 271
  • 272
  • 273
  • 274
  • 275
  • 276
  • 277
  • 278
  • 279
  • 280
  • 281
  • 282
  • 283
  • 284
  • 285
  • 286
  • 287
  • 288
  • 289
  • 290
  • 291

Deskstar T7K500 Hard Disk Drive Specification
61
7.6
Vibration and shock
All vibration and shock measurements recorded in this section are made with a drive that has no mounting attach-
ments for the systems. The input power for the measurements is applied to the normal drive mounting points.
7.6.1
Operating vibration
7.6.1.1
Random vibration
The test is 30 minutes of random vibration using the power spectral density (PSD) levels shown below in each of
three mutually perpendicular axes. The disk drive will operate without non-recoverable errors when subjected to
the above random vibration levels.
The overall RMS (root mean square) level is 0.67 G.
7.6.1.2
Swept sine vibration
The drive will meet the criteria shown below while operating in the specified conditions:
No errors occur with 0.5 G 0 to peak, 5 to 300 to 5 Hz sine wave, 0.5 oct/min sweep rate with 3-minute
dwells at two major resonances
No data loss occurs with 1 G 0 to peak, 5 to 300 to 5 Hz sine wave, 0.5 oct/min sweep rate with 3-minute
dwells at two major resonances
7.6.2
Nonoperating vibration
The drive does not sustain permanent damage or loss of previously recorded data after being subjected to the envi-
ronment described below
7.6.2.1
Random vibration
The test consists of a random vibration applied in each of three mutually perpendicular axes for a duration of 10
minutes per axis. The PSD levels for the test simulate the shipping and relocation environment shown below.
The overall RMS (root mean square) level of vibration is 1.04 G.
7.6.2.2
Swept sine vibration
2 G (zero-to-peak), 5 to 500 to 5 Hz sine wave
0.5 oct/min sweep rate
3 minutes dwell at two major resonances
Table 43: Random vibration PSD profile break points (operating)
Direction
5Hz
17Hz
45Hz
48Hz
62Hz
65Hz
150Hz
200Hz
500Hz
RMS
(G)
x10
-3
[G2/Hz]
0.02
1.1
1.1
8.0
8.0
1.0
1.0
0.5
0.5
0.67
Table 44: Random Vibration PSD profile breakpoints (nonoperating)
Frequency
2Hz
4Hz
8Hz
40Hz
55Hz
70Hz
200Hz
G2/Hz
0.001
0.03
0.03
0.003
0.01
0.01
0.001