U Series CE Family Product Manual, Rev. A 13
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.
1.8.6.2 Nonoperating vibration
The following table lists the maximum nonoperating vibratio n that the
drive may experience without incurring physical damage or de gradation
in performance when subsequently put into operation.
1.9 Drive acoustics
Drive acoustics are measured as overall A-weighted a coustic sound
power levels (no pure tones). All measurements are gen erally consistent
with ISO document 7779. Sound power measurements were taken
under essentially free-field conditions over a reflecting plane. F or 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)
5–21 Hz 0.02-inch displacement (peak to peak)
22–350 Hz 0.5 Gs acceleration (zero to peak)
351–500 Hz 0.25 Gs acceleration (zero to peak)
5–21 Hz 0.2-inch displacement (peak to peak)
22–350 Hz 5.0 Gs acceleration (zero to peak)
351–500 Hz 1.0 Gs acceleration (zero to peak)
ST380020ACE, ST360020ACE, ST340810ACE and ST320410ACE
Acoustic mode Idle P erformance Seek
Sound power (bels) 2.7 (typ) 3.0 (max) 2.9 (typ) 3.2 (max)