Shock; Non-Operating Vibration; Acoustics; Test For Prominent Discrete Tones (Pdts) - Seagate Surveillance HDD Product Manual

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2.9.5

Shock

All shock specifications assume that the drive is mounted securely with the input shock applied at the drive mounting screws. Shock
may be applied in the X, Y or Z axis.
2.9.5.1 Operating shock
These drives comply with the performance levels specified in this document when subjected to a maximum operating shock of 70 Gs
based on half-sine shock pulses of 2ms during read operations. Shocks should not be repeated more than two times per second.
2.9.5.2 Non-operating shock
The non-operating shock level that the drive can experience without incurring physical damage or degradation in performance when
subsequently put into operation is 250 Gs based on a non-repetitive half-sine shock pulse of 2ms duration.
2.9.5.3 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 0.25 Gs (Limited displacement)
22Hz to 350Hz 0.50 Gs
350Hz to 500Hz 0.25 Gs
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. Throughput may vary if improperly mounted.
2.9.6

Non-operating vibration

The maximum non-operating 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 3.0 Gs (Limited displacement)
22Hz to 350Hz 3.0 Gs
350Hz to 500Hz 3.0 Gs

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
Idle*
2.7 bels (typical)
2.8 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.
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 Surveillance HDD Product Manual, Rev. B (Draft 2)
Seek
2.8 bels (typical)
2.9 bels (max)
Drive Specifications
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