Seagate Barracuda XT Barracuda XT Series SATA Product Manual - Page 18

Drive Specifications www.seagate.com 2.7.5 Shock All shock specifications assume that the drive is mounted securely with the input shock applied at the drive mounting screws. Shock may be applied in the X, Y or Z axis. 2.7.5.1 Operating shock These drives comply with the performance levels specified in this document when subjected to a maximum operating shock of 63 Gs based on half-sine shock pulses of 2ms during read operations. Shocks should not be repeated more than two times per second. 2.7.5.2 Nonoperating shock The nonoperating shock level that the drive can experience without incurring physical damage or degradation in performance when subsequently put into operation is 300 Gs based on a nonrepetitive half-sine shock pulse of 2ms duration. 2.7.6 Vibration All vibration specifications assume that the drive is mounted securely with the input vibration applied at the drive mounting screws. Vibration may be applied in the X, Y or Z axis. 2.7.6.1 Operating vibration The maximum vibration levels that the drive may experience while meeting the performance standards specified in this document are specified below. 5 to 350Hz 350 to 500Hz 0.50 Gs 0.25 Gs 2.7.6.2 Nonoperating vibration The maximum nonoperating vibration levels that the drive may experience without incurring physical damage or degradation in performance when subsequently put into operation are specified below. 5 to 350Hz 350 to 500Hz 5.0 Gs 2.0 Gs 2.8 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 Drive A-weighted Sound Power Levels (SWL, BA) Model Idle[1] Performance Seek 3000GB 2.7 bels (typ) 2.9 bels (max) 2.9 bels (typ) 3.1 bels (max) 2000GB 2.7 bels (typ) 2.9 bels (max) 2.9 bels (typ) 3.3 bels (max) [1] 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. 18 Barracuda XT SATA Product Manual, Rev. D