Acoustics - Seagate Barracuda 5400.1 ST320015A Product Manual

Ultra ata interface drives

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2.11

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.

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 1:

Fluid Dynamic Bearing (FDB) motor acoustics

Model

ST320015A

*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.

Barracuda 5400.1 Product Manual, Rev. A

Idle*

2.6 bels (typ)

2.8 bels (max)

Acoustic mode

Quiet seek

Performance seek

2.7 bels (typ)

2.8 bels (typ)

2.9 bels (max)

3.0 bels (max)

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