Seagate LD25 Product Manual - Page 19

2.11 Acoustics Drive acoustics are measured as overall A-weighted acoustic sound power levels. 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 5: Drive level acoustics Idle* 2.4 bels (typ) Seek 2.7 bels (typ) *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. 2.12 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 6: Radio frequency environments Test Electrostatic discharge Radiated RF immunity Electrical fast transient Surge immunity Conducted RF immunity Voltage dips, interrupts Description Performance level Reference standard Contact, HCP, VCP: ± 4 kV; Air: ± 8 kV B EN 61000-4-2: 95 80 to 1,000 MHz, 3 V/m, A 80% AM with 1 kHz sine 900 MHz, 3 V/m, 50% pulse modulation @ 200 Hz EN 61000-4-3: 96 ENV 50204: 95 ± 1 kV on AC mains, ± 0.5 kV on external B I/O EN 61000-4-4: 95 ± 1 kV differential, ± 2 kV common, AC B mains EN 61000-4-5: 95 150 kHz to 80 MHz, 3 Vrms, 80% AM with A 1 kHz sine EN 61000-4-6: 97 0% open, 5 seconds 0% short, 5 seconds 40%, 0.10 seconds 70%, 0.01 seconds C EN 61000-4-11: 94 C C B A - 1) No upset or degradation in performance beyond manufacturer's specified limits. 2) No data loss. B - 1) Unit self recovers without user intervention. 2) No data loss. C - 1) Upset OK provided that unit will function after user intervention. LD25 Series SATA Product Manual, Rev. C 13