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18 Barracuda XT SATA Product Manual, Rev. D
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.
2.7.5.1 Operating 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.
2.7.5.2 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
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.
2.7.6.1 Operating vibration
The maximum vibration levels that the drive may experience while meeting the performance standards specified
in this document are specified below.
2.7.6.2 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.
2.8 Acoustics
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.
[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.
5 to 350Hz 0.50 Gs
350 to 500Hz 0.25 Gs
5 to 350Hz 5.0 Gs
350 to 500Hz 2.0 Gs
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 4 Drive A-weighted Sound Power Levels (SWL, BA)
Model
Idle
[1]
Performance Seek
3000GB
2.7 bels (typ)
2.9 bels (max)
2.9 bels (typ)
3.1 bels (max)
2000GB
2.7 bels (typ)
2.9 bels (max)
2.9 bels (typ)
3.3 bels (max)