Seagate ST3500841SCE, ST3120213SCE Acoustics, Nonoperating shock, Vibration, Operating vibration

2.9.5.2Nonoperating 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.

2.9.6Vibration

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.

2.9.6.1Operating 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

2.9.6.2Nonoperating 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

2.10Acoustics

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	Operational, PVR (Personal Video Recorder) seeks
2.46 bels (typ)	2.57 bels (typ)	2.50 bels (typ)
2.65 bels (max)	2.64 bels (max)	2.57 bels (max)

DB35.2 Serial ATA Product Manual, Rev. C 17