Seagate ST340016A - 1.9 Drive acoustics

14 Barracuda ATA IV Family Product Manual, Rev. B
1.9 Drive 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 essen-
tially 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
.
ST380021A, ST360021A (2 disc)
Acoustic mode
Sound power (bels):
Idle* Quiet seek Performance seek
Fluid dynamic bear-
ing motor (FDB)
2.5 (typ)
2.7 (max)
2.8 (typ)
3.0 (max)
3.3 (typ)
3.6 (max)
ST340016A, ST320011A (1 disc)
Acoustic mode
Sound power (bels):
Idle* Quiet seek Performance seek
Fluid dynamic bear-
ing motor (FDB)
2.1 (typ)
2.3 (max)
2.4 (typ)
2.6 (max)
3.0 (typ)
3.4 (max)