Seagate ST500DM002 Barracuda 7200.9 PATA Product Manual - Page 35
Note., Table 14, Fluid Dynamic Bearing FDB motor acoustics
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2.10 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 14: Fluid Dynamic Bearing (FDB) motor acoustics Acoustic mode ST3402111A ST3802110A ST3120213A, ST3120814A, ST3160212A, ST3160812A ST3200827A, ST3250824A, ST3250624A, ST3320833A, ST3320633A, ST3300622A, ST3300822A ST3500641A, ST3500841A, ST3400633A, ST3400833A Idle* 2.0 bels (typ) 2.3 bels (max) 2.5 bels (typ) 2.7 bels (max) 2.5 bels (typ) 2.7 bels (max) 2.7 bels (typ) 2.9 bels (max) 2.8 bels (typ) 3.0 bels (max) Quiet seek 2.4 bels (typ) 2.6 bels (max) 2.7 bels (typ) 2.9 bels (max) 2.8 bels (typ) 3.0 bels (max) 3.0 bels (typ) 3.2 bels (max) 3.2 bels (typ) 3.4 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. Barracuda 7200.9 PATA Product Manual, Rev. F 29