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2.8.5 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.
2.8.5.1
Operating shock
These drives comply with the performance levels specified in this document when subjected to a maximum operating
shock of 70 Gs (read) and 40 Gs (write) based on half-sine shock pulses of 2ms during read operations. Shocks should not
be repeated more than two times per second.
2.8.5.2
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.
2.8.6 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.
2.8.7 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 500Hz
3.0 Gs
2.9
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
Note
following equation: (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)
8TB model
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.
2.9.1 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 Archive HDD Product Manual, Rev. A
Drive Specifications
Seek
2.8 bels (typical)
2.9 bels (max)
16
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