Vibration; Drive Acoustics - Seagate Barracuda ATA II 100 Series Product Manual

Barracuda ATA II 100 Family Product Manual, Rev. A

1.8.6 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.
1.8.6.1 Operating vibration
The following table lists the maximum vibration levels that the drive may expe-
rience while meeting the performance standards specified in this document.
5–22 Hz 0.010-inch displacement (zero to peak)
22–300 Hz 0.5 Gs acceleration (zero to peak)
1.8.6.2 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.
5–22 Hz 0.10-inch displacement (zero to peak)
22–300 Hz 5.0 Gs acceleration (zero to peak)

1.9 Drive acoustics

Drive acoustics are measured as overall A-weighted acoustic sound
power levels (no pure tones). All measurements are generally consistent
with ISO document 7779. Sound power measurements were taken
under essentially free-field conditions over a reflecting plane. For all
tests, the drive was oriented with the cover facing upward.
Note. For seek mode tests, the drive was 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)
Acoustic mode
Sound pressure (dBA) 34.0 (typ) 39.0 (max)
Idle mode
13
Seek mode
39.0 (typ) 43.5 (max)