Seagate ST3320311CS Pipeline HD Series SATA Product Manual - Page 20

Drive Specifications www.seagate.com 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 4 Fluid Dynamic Bearing (FDB) motor acoustics Model ST2000VM002 ST1500VM002 ST1000VM002 Idle* 2.0 bels (typ) 2.2 bels (max) 1.9 bels (typ) 2.1 bels (max) Seek 2.2 bels (typ) 2.4 bels (max) 2.2 bels (typ) 2.3 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. 2.10.1 Test for Prominent Discrete Tones (PDTs) Seagate follows the ECMA-74 standards for measurement and identification of PDTs. An exception to this process is the use of the absolute threshold of hearing. Seagate uses this threshold curve (originated in ISO 3897) to discern tone audibility and to compensate for the inaudible components of sound prior to computation of tone ratios according to Annex D of the ECMA-74 standards. 2.11 Electromagnetic immunity When properly installed in a representative host system, the drive operates without errors or degradation in performance when subjected to the radio frequency (RF) environments defined in the following table: Table 5 Radio frequency environments Test Electrostatic discharge Description Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV Performance Level Reference standard B EN61000-4-2: 95 Radiated RF immunity 80MHz to 1,000MHz, 3 V/m, 80% AM with 1kHz sine 900MHz, 3 V/m, 50% pulse modulation @ 200Hz EN61000-4-3: 96 A ENV 50204: 95 Electrical fast transient ± 1 kV on AC mains, ± 0.5 kV on external I/O B EN61000-4-4: 95 Surge immunity ± 1 kV differential, ± 2 kV common, AC mains B EN61000-4-5: 95 Conducted RF 150kHz to 80MHz, 3 Vrms, 80% AM with 1kHz immunity sine A EN61000-4-6: 97 Voltage dips, interrupts 0% open, 5 seconds 0% short, 5 seconds 40%, 0.10 seconds 70%, 0.01 seconds C EN61000-4-11: 94 C C B 20 Pipeline HD SATA Product Manual, Rev. D