Seagate ST340015A Product Manual - Page 24
Barracuda 5400.1 Product Manual, Rev. F, Acoustics, Note., Acoustic mode
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16 Barracuda 5400.1 Product Manual, Rev. F 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 ST340015A 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) *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.