Seagate ST980412ASG, ST9500420ASG, ST9320423ASG, ST9250410ASG, ST9160412AS manual Acoustics

2.10.6.2Nonoperating 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 msec 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 msec duration.

The nonoperating shock level that the drive can experience without incurring physical damage or degradation in performance when subsequently put into operation is 600 Gs based on a nonrepetitive half-sine shock pulse of 0.5 msec duration.

2.10.7Vibration

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.

2.10.7.1Operating vibration

The maximum vibration levels that the drive may experience while meeting the performance standards speci- fied in this document are specified below.

5–500 Hz

1.0 Gs (0 to peak). Max displacement may apply below 10 Hz.

2.10.7.2Nonoperating 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.

5–500 Hz:

5 Gs (0 to peak). Max displacement may apply below 22 Hz.

2.11Acoustics

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.

Table 5: Drive A-weighted Sound Power Levels (SWL, BA)

Idle*	Performance seek
2.3 bels (typ)	2.5 bels (typ)
2.5 bels (max)	2.7 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.

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.

Momentus 7200.4 SATA Product Manual, Rev. C 13