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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)
Table 6:
Fluid Dynamic Bearing (FDB) motor acoustics
Acoustic mode
Idle*
STM3320820A
2.7 Bels (typ)
3.0 Bels (max)
STM3300620A
2.5 Bels (typ)
STM3250820A
2.8 Bels (max)
STM3250620A
STM3200820A
*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.
20
Quiet seek
3.0 Bels (typ)
3.4 Bels (max)
3.0 Bels (typ)
3.1 Bels (max)
DiamondMax 21 PATA Product Manual, Rev. A
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