Seagate ST3600957FC Cheetah 15K.5 SAS Product Manual - Page 36
in 3 Gbit operation
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ST3146855SS in 3 Gbit operation Typical power dissipation under idle conditions in 3Gb operation is 11.8 watts (40.27 BTUs per hour). To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 8). 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. CURRENT/POWER vs QUEUE DEPTH (SATA - 3.0GB) Random 128 Block Write/Reads 1.400 14.00 5Volt A 1.200 12.00 12 Volt A Wat t s 1.000 10.00 Amperes Power (watts) 0.800 8.00 0.600 6.00 0.400 4.00 0.200 2.00 0.000 0.00 0 1 2 3 4 5 6 7 88 9 10 11 12 13 14 15 1166 17 18 19 20 2122 23 24 25 26 27 2829 30 31322 33 34 Queue Depth Figure 9. ST3146855SS (3 Gbit) DC current and power vs. input/output operations per second 30 Cheetah 15K.5 SAS Product Manual, Rev. E