Vibration; Acoustics; Test For Prominent Discrete Tones (Pdts) - Seagate ST500VM000 Product Manual

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2.9.6

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, with linear swept sine inputs.
2.9.6.1 Operating vibration
The maximum vibration levels that the drive may experience while meeting the performance standards specified in this
document are specified below.
2Hz to 22Hz
22Hz to 350Hz
350Hz to 500Hz
2.9.6.2 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.
5Hz to 22Hz
22Hz to 350Hz
35Hz to 500Hz

2.10 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.
For seek mode tests, the drive is placed in seek mode only. The number of
seeks per second is defined by the following equation:
Note
(Number of seeks per second = 0.4 / (average latency + average access time)
Table 3 Fluid Dynamic Bearing (FDB) motor acoustics
Model
ST1000VM002,
ST500VM000
*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.

2.10.1 Test for Prominent Discrete Tones (PDTs)

Seagate follows the ECMA-74 standards for measurement and identification of PDTs. An exception to this process is the
use of the absolute threshold of hearing. Seagate uses this threshold curve (originated in ISO 389-7) to discern tone
audibility and to compensate for the inaudible components of sound prior to computation of tone ratios according to
Annex D of the ECMA-74 standards.
Seagate Video 3.5 HDD Product Manual, Rev. B
0.25 Gs (Limited displacement)
0.50 Gs
0.25 Gs
3.0 Gs (limited displacement)
3.0 Gs
3.0 Gs
Idle*
1.9 bels (typ)
2.1 bels (max)
Seek
2.2 bels (typ)
2.3 bels (max)
16