Seagate Barracuda 7200.10 PATA, Product Manual

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18 Barracuda 7200.10 PATA Product Manual, Rev. A
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 l 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.
Table 5: Fluid Dynamic Bearing (FDB) motor acoustics
Acoustic mode
Idle* Quiet seek
ST3750840A
ST3750640A
ST3500830A
ST3500630A 2.7 bels (typ)
3.0 bels (max) 3.0 bels (typ)
3.4 bels (max)
ST3400820A
ST3400620A
ST3320820A
ST3320620A 2.8 bels (typ)
3.0 bels (max) 3.2 bels (typ)
3.4 bels (max)
ST3300820A
ST3300620A
ST3250820A
ST3200820A 2.5 bels (typ)
2.8 bels (max) 3.0 bels (typ)
3.1 bels (max)