Vibration; Acoustics - Seagate DB35.2 Serial ATA Product Manual

2.9.5.2 Nonoperating shock
The nonoperating shock level that the drive can experience without incurring physical damage or degradation
in performance when subsequently put into operation is 300 Gs for 500, 400, and 300 GB drives and 350 Gs
for 250, 200, 160, ad 80 GB drives, based on a nonrepetitive half-sine shock pulse of 2 msec duration.
2.9.6

Vibration

All vibration specifications assume that the drive is mounted securely with the input vibration applied at the
drive mounting screws. Vibration may be applied in the X, Y or Z axis.
2.9.6.1 Operating vibration
The maximum vibration levels that the drive may experience while meeting the performance standards speci-
fied in this document are specified below.
5–22 Hz +/-0.25", Displacement limited
22–350 Hz 0.50 Gs
350–500 Hz 0.25 Gs
2.9.6.2 Nonoperating vibration
The following table lists the maximum nonoperating vibration that the drive may experience without incurring
physical damage or degradation in performance when subsequently put into operation.
5–22 Hz 0.25 G (Limited displacement)
22–350 Hz 5.0 Gs
350–500 Hz 1.0 Gs
2.10

Acoustics

Drive acoustics are measured as overall A-weighted acoustic sound power levels (no pure tones). All mea-
surements are consistent with ISO document 7779. Sound power measurements are taken under essentially
free-field conditions over a reflecting plane. For all tests, the drive is oriented with the cover facing upward.
Note. For seek mode tests, the drive is placed in seek mode only. The number of seeks per second is
defined by the following equation:
(Number of seeks per second = 0.4 / (average latency + average access time)
Drive acoustics, sound power
Idle Operational, CE seeks
2.46 bels (typ) 2.57 bels (typ)
2.65 bels (max) 2.64 bels (max)
DB35.2 Serial ATA Product Manual, Rev. C
Operational, PVR (Personal Video Recorder) seeks
2.50 bels (typ)
2.57 bels (max)
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