Vibration; Acoustics; Test For Prominent Discrete Tones (Pdts) - Seagate ST500LT012 Product Manual

2.8.2

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.
2.8.2.1 Operating vibration
The maximum vibration levels that the drive may experience while meeting the performance standards specified in this document are
specified below.
5–200 Hz 2.0 Gs (0 to peak). Max displacement may apply below 10 Hz.
201–500 Hz
2.8.2.2
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.
5–500 Hz 5.0 Gs (0 to peak). Max displacement may apply below 22 Hz.
2.9

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.
Table 6 Drive A-weighted Sound Power Levels (SWL, BA)
(1)
Idle
2.0 bels (typ)
2.2 bels (max)
1. 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 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.
S L T HDD P
EAGATE APTOP HIN
1.0 Gs (0 to peak).
Performance Seek
2.2 bels (typ)
2.4 bels (max)
M , R . K
RODUCT ANUAL EV
D S
RIVE PECIFICATIONS
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