Seagate ST9750423AS, Руководство по эксплуатации продукта

Страница: 21 / 46

Momentus Product Manual, Rev. A 15
3.10.6.2 Nonoperating shock
The nonoperating shock level that the drive can experience without incurring physical damage or degradation
in performance when subsequently put into operation is 800 Gs based on a nonrepetitive half-sine shock pulse
of 2 ms duration.
The nonoperating shock level that the drive can experience without incurring physical damage or degradation
in performance when subsequently put into operation is 1000 Gs based on a nonrepetitive half-sine shock
pulse of 1 ms duration.
The nonoperating shock level that the drive can experience without incurring physical damage or degradation
in performance when subsequently put into operation is 1000 Gs based on a nonrepetitive half-sine shock
pulse of 0.5 ms duration.
3.10.7 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.
3.10.7.1 Operating vibration
The maximum vibration levels that the drive may experience while meeting the performance standards speci-
fied in this document are specified below.
3.10.7.2 Nonoperating vibration
The maximum nonoperating vibration levels that the drive may experience without incurring physical damage or degrada-
tion in performance when subsequently put into operation are specified below
.
3.11 Acoustics
Drive emission of sound is measured consistent with the ECMA-74 and its referenced standards. Testing is
conducted at room temperature (approximately 25
°
C). Emission levels are reported as the total A-weighted
sound power levers for steady state, idle, and active seeks modes of operation.
*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 .
Test for Prominent Discrete Tones (PDTs)
Seagate follows the ECMA-74 standards for measurement and identification of PDTs. An exception to this pro-
cess is the use of the absolute threshold of hearing. Seagate uses the lower limit for the threshold curve* 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.
*Defined as the median curve given by ISO 389-7 (Tf curve) minus 10dB at all frequencies.
5–200 Hz 2.0 Gs (0 to peak). Max displacement may apply below 10 Hz.
200–500 Hz 1.0 Gs (0 to peak).
5–500 Hz: 5 Gs (0 to peak). Max displacement may apply below 22 Hz.
Table 5: Drive A-weighted Sound Power Levels (SWL, BA)
Idle* Performance seek
2.3 bels (typ)
2.5 bels (max)
2.6 bels (typ)
2.7 bels (max)