Seagate Enterprise Capacity 3.5 HDD/Constellation ES Constellation ES (.1) SA - Page 24

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 6 Fluid Dynamic Bearing (FDB) motor acoustics 2TB models 1TB models 500GB models Idle* 2.7 bels (typ) 2.9 bels (max) 2.2 bels (typ) 2.5 bels (max) 1.9 bels (typ) 2.3 bels (max) Performance seek 3.0 bels (typ) 3.3 bels (max) 2.8 bels (typ) 3.1 bels (max) 2.7 bels (typ) 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. 2.11 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 389-7) 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. 2.12 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 7 Radio frequency environments Test Electrostatic discharge Radiated RF immunity Electrical fast transient Surge immunity Conducted RF immunity Voltage dips, interrupts Description Performance level Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV B 80 to 1000 MHz, 3 V/m, 80% AM with 1 kHz sine A 900 MHz, 3 V/m, 50% pulse modulation @ 200 Hz ± 1 kV on AC mains, ± 0.5 kV on external I/O B ± 1 kV differential, ± 2 kV common, AC mains B 150 kHz to 80 MHz, 3 Vrms, 80% AM with 1 kHz sine A 0% open, 5 seconds C 0% short, 5 seconds C 40%, 0.10 seconds C 70%, 0.01 seconds B Reference standard EN 61000-4-2: 95 EN 61000-4-3: 96 ENV 50204: 95 EN 61000-4-4: 95 EN 61000-4-5: 95 EN 61000-4-6: 97 EN 61000-4-11: 94 CONSTELLATION ES SERIAL ATA PRODUCT MANUAL, REV. F 19