Seagate ST34321A Product Manual - Page 22

14 Medalist 8641, 6531, 4321, 3221 and 2110, Rev. B 1.9 Drive acoustics Drive acoustics are measured as overall A-weighted acoustic sound power levels (no pure tones). All measurements are generally 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. For the Seek mode, the drive is placed in seek 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) Mode Typical sound Maximum sound power (bels) power (bels) Idle 3.5 3.9 Read/Write 4.0 4.3 1.10 Electromagnetic susceptibility These drives operate without errors when subjected to the following: Radiated noise Electrostatic discharge* Magnetic field strength ≤ 3 volt/meter, 30 Hz to 500 MHz ≤ 10 KVolts ≤ 5 Gauss * Electrostatic discharge susceptibility is measured with the drive mounted in a representative computer system (mounted to a ground plane with earth grounding). Discharges are applied to the bezel or other external surfaces on the ground plane. 1.11 Reliability Nonrecoverable read errors Mean time between failures Contact start-stop cycles 1 per 1014 bits read, max 400,000 power-on hours (nominal power, 25°C ambient temperature) 40,000 cycles (at nominal voltage and temperature, with 60 cycles per hour and a 50% duty cycle)