Seagate Cheetah 15K Cheetah 15K.5 SCSI Product Manual - Page 33
ST3146855LW/ST3146855LC
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ST3146855LW/ST3146855LC For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 10.39 watts (35.45 BTUs per hour). To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 4). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the corresponding +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by 3.4123. Amperes 1.800 1.600 1.400 1.200 1.000 0.800 0.600 0.400 0.200 0.000 0.0 ST3146855LC CURRENT/POWER vs THROUGHPUT (SCSI - LVD) Random 8 Block Reads 18.00 16.00 14.00 12.00 10.00 8.00 6.00 4.00 2.00 0.00 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0 I/Os per Second Figure 4. ST3146855LC DC current and power vs. IOPS (LVD) Power (watts) 5Vo lt A 12 Vo lt A Watts Cheetah 15K.5 SCSI Product Manual, Rev. J 27