S
EAGATE
U
LTRA
M
OBILE
SSHD P
RODUCT
M
ANUAL
, R
EV
. D
11
D
RIVE
S
PECIFICATIONS
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.
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.
2.9
A
COUSTICS
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.
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.
5–200 Hz
2.0 Gs (0 to peak). Max displacement may apply below 10 Hz.
201–500 Hz
1.0 Gs (0 to peak).
5–500 Hz
5.0 Gs (0 to peak). Max displacement may apply below 22 Hz.
Table 6
Drive A-weighted Sound Power Levels (SWL, BA)
I
DLE
(1)
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
.
P
ERFORMANCE
S
EEK
2.0 bels (typ)
2.2 bels (max)
2.2 bels (typ)
2.4 bels (max)
