Vibration; Acoustics - Seagate ST3250623NS 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 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 Limited displacement
23–350 Hz 0.5 G acceleration
2.9.6.2 Nonoperating vibration
The maximum nonoperating vibration levels that the drive may experience without incurring physical damage
or degradation in performance when subsequently put into operation are specified below.
5–22 Hz Limited displacement
23–350 Hz 5.0 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)
Table 3: Fluid Dynamic Bearing (FDB) motor acoustics
Idle*
2.8 bels (typ)
3.4 bels (max)
*During periods of drive idle, some offline activity may occur according to the S.M.A.R.T. specification, which
may increase acoustic and power to operational levels.
12 NL35 Series SATA Product Manual, Rev. B