Seagate ST32000641AS, ST33000651AS manual Shock, Vibration, Acoustics

Drive Specifications www.seagate.com

2.7.5 Shock

All shock specifications assume that the drive is mounted securely with the input shock applied at the drive mounting screws. Shock may be applied in the X, Y or Z axis.

2.7.5.1Operating shock

These drives comply with the performance levels specified in this document when subjected to a maximum operating shock of 63 Gs based on half-sine shock pulses of 2ms during read operations. Shocks should not be repeated more than two times per second.

2.7.5.2Nonoperating 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 based on a nonrepetitive half-sine shock pulse of 2ms duration.

2.7.6 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.

2.7.6.1Operating vibration

The maximum vibration levels that the drive may experience while meeting the performance standards specified in this document are specified below.

5 to 350Hz	0.50 Gs
350 to 500Hz	0.25 Gs

2.7.6.2Nonoperating 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 to 350Hz	5.0 Gs
350 to 500Hz	2.0 Gs

2.8Acoustics

Drive acoustics are measured as overall A-weighted acoustic sound power levels (no pure tones). All measurements 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.

	For seek mode tests, the drive is placed in seek mode only. The number of seeks per second is defined by
Note	the following equation:
	(Number of seeks per second = 0.4 / (average latency + average access time)

Table 4 Drive A-weighted Sound Power Levels (SWL, BA)

Model	Idle[1]	Performance Seek
3000GB	2.7 bels (typ)	2.9 bels (typ)
	2.9 bels (max)	3.1 bels (max)
2000GB	2.7 bels (typ)	2.9 bels (typ)
	2.9 bels (max)	3.3 bels (max)

[1]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.

18 Barracuda XT SATA Product Manual, Rev. D