Vibration; Acoustics - Seagate EE25 Series Product Manual

2.11.2

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.
2.11.2.1 Operating vibration
The following table lists the maximum vibration levels that the drive may experience while meeting the perfor-
mance standards specified in this document.
10–200 Hz 2.0 G (0 to peak)
200–500 Hz 1.0 G (0 to peak)
2.11.2.2 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.
5–500 Hz 5.0 Gs (0 to peak). Max displacement may apply below 22 Hz.
2.12

Acoustics

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)
Acoustic mode
Idle* Normal Seek
2.3 bels (typ) 2.5 bels (typ)
2.5 bels (max) 2.7 bels (max)
*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.
16
Performance Seek
2.8 bels (typ)
3.0 bels (max)
EE25 Series Product Manual, Rev. E