Seagate Barracuda XT Barracuda XT Series SATA Product Manual - Page 12

Drive Specifications www.seagate.com 2.3 Recording and interface technology Interface Recording method Recording density (kbits/inch max) Track density (ktracks/inch avg) Areal density (Gbits/inch2 avg) Spindle speed (RPM) Internal data transfer rate (Mb/s max) Sustained data transfer rate (MB/s max) I/O data-transfer rate (MB/s max) ST33000651AS SATA Perpendicular 1941kb/in 277 ktracks/in 488Gb/in2 7200 + 0.2% 1900Mb/s 149MB/s 600MB/s ST32000641AS SATA Perpendicular 1721kb/in 240 ktracks/in 347Gb/in2 7200 + 0.2% 1300Mb/s 138MB/s 600MB/s 2.4 Physical characteristics Maximum height Maximum width Maximum length Typical weight Cache buffer ST33000651AS 26.1mm / 1.028 in 101.85mm / 4.010 in 146.99mm / 5.787 in 700g / 1.543 lb 64MB (64,768kb) ST32000641AS 26.1mm / 1.028 in 101.85mm / 4.010 in 146.99mm / 5.787 in 700g / 1.543 lb 64MB (64,768kb) 2.5 Start/stop times Power-on to ready (s) max. Standby to ready (s) max. Ready to spindle stop (s) max. 3000GB 18.0 18.0 20.0 2000GB 15.0 15.0 20.0 2.6 Power specifications The drive receives DC power (+5V or +12V) through a native SATA power connector. See Figure 5 on page 24. Power consumption Power requirements for the drives are listed in the table on page 9. Typical power measurements are based on an average of drives tested, under nominal conditions, using 5.0V and 12.0V input voltage at 25°C ambient temperature. • Spinup power Spinup power is measured from the time of power-on to the time that the drive spindle reaches operating speed. • Seek mode During seek mode, the read/write actuator arm moves toward a specific position on the disk surface and does not execute a read or write operation. Servo electronics are active. Seek mode power represents the worst- 12 Barracuda XT SATA Product Manual, Rev. D