Seagate ST920813AM, ST940813AM Acoustics, Vibration, Operating vibration, Nonoperating vibration

2.11.2Vibration

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.

2.11.2.1Operating 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)

2.11.2.2Nonoperating 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.

2.12Acoustics

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	Performance Seek
2.3 bels (typ)	2.5 bels (typ)	2.8 bels (typ)
2.5 bels (max)	2.7 bels (max)	3.0 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 EE25 Series Product Manual, Rev. E