Product manual
Constellation ES.3 Serial ATA Product Manual, Rev. E 21
2.7.4.1 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. Shocks should not be repeated more than two
times per second.
2.7.4.2 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 300 Gs based on a nonrepetitive half-sine shock pulse of 2ms
duration.
2.7.5 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.
2.7.5.1 Operating vibration
The maximum vibration levels that the drive may experience while meeting the performance standards specified in this
document are specified below.
* Rotary Random Operating Vibration
2.7.5.2 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.
2.8 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.
)
*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.
5–22 Hz 0.25 Gs
22–350 Hz 0.50 Gs
350–500 Hz 0.25 Gs
20 - 1500Hz
*(RROV)
12.5 rads/s
2
w/RVFF
10–500 Hz
Linear Random
4.9 Grms ref
Note
For seek mode tests, the drive is placed in seek mode only. The
number of seeks per second is defined by the following equation:
(Number of seeks per second = 0.4 / (average latency + average access time
Table 6 Fluid Dynamic Bearing (FDB) motor acoustics
Idle* Performance seek
All models 2.8 bels (typ)
3.0 bels (max)
3.0 bels (typ)
3.4 bels (max)