Seagate DB35 Serial ATA ST3300831SCE - Manual (Page 19)

DB35 Serial ATA Product Manual, Rev. D 11
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 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.
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.
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)
5–350 Hz 0.25 G acceleration (zero to peak)
5–22 Hz 0.25 G
22–350 Hz 5.0 Gs
Table 3: Fluid Dynamic Bearing (FDB) motor acoustics
Acoustic mode
Models Idle Operational
ST3400832SCE 2.6 bels (typ)
2.8 bels (max)
2.8 bels (typ)
3.0 bels (max)
ST3300831SCE
ST3250823SCE
ST3200826SCE 2.4 bels (typ)
2.7 bels (max)
2.8 bels (typ)
3.0 bels (max)