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Barracuda ES Serial ATA Product Manual, Rev. D 21
2.9.6 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.
2.9.6.1 Operating vibration
The maximum vibration levels that the drive may experience while meeting the performance standards speci-
fied in this document are specified below.
2.9.6.2 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.
2.10 Acoustics
Drive acoustics are measured as overall A-weighted acoustic sound power levels (no pure tones). All mea-
surements 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.
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)
*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 (Limited displacement)
22–350 Hz 0.50 Gs
350–500 Hz 0.25 Gs
5–22 Hz 0.25 Gs (limited displacement)
22–350 Hz 5.0 Gs
350–500 Hz 1.0 Gs
Table 7: Fluid Dynamic Bearing (FDB) motor acoustics
Idle* Performance seek
ST3750640NS, ST3750840NS 2.7 bels (typ)
3.0 bels (max)
3.2 bels (typ)
3.9 bels (max)
ST3500630NS, ST3500830NS 2.5 bels (typ)
2.8 bels (max)
3.2 bels (typ)
3.5 bels (max)
ST3400620NS, ST3400820NS
ST3320620NS, ST3320820NS
2.5 bels (typ)
2.8 bels (max)
3.2 bels (typ)
3.5 bels (max)
ST3250620NS, ST3250820NS 2.5 bels (typ)
2.8 bels (max)
3.2 bels (typ)
3.5 bels (max)