Seagate ST336754SS Cheetah 15K.4 SAS Product Manual - Page 42
Typical power dissipation under idle conditions in 1.5 Gbit operation is 12.0 watts 40.95 BTUs per
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ST373454SS 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. ST373454SS DC CURRENT/POWER vs THROUGHPUT (3 Gbit) Random 8 Block Reads 1.800 18.00 5Vo lt A 1.600 16.00 12 Volt A Watts 1.400 14.00 Amperes Power (watts) 1.200 12.00 1.000 10.00 0.800 8.00 0.600 6.00 0.400 0.0 4.00 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0 I/Os per Second Figure 10. ST373454SS (3 Gbit) DC current and power vs. input/output operations per second ST373454SS in 1.5 Gbit operation Typical power dissipation under idle conditions in 1.5 Gbit operation is 12.0 watts (40.95 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. ST373454SS DC CURRENT/POWER vs THROUGHPUT (1.5 Gbit) Random 8 Block Reads 1.800 18.00 5Volt A 1.600 16.00 12 Vo lt A Watts 1.400 14.00 Amperes Power (watts) 1.200 12.00 1.000 10.00 0.800 8.00 0.600 6.00 0.400 0.0 4.00 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0 I/Os per Second Figure 11. ST373454SS (1.5 Gbit) DC current and power vs. input/output operations per second 32 Cheetah 15K.4 SAS Product Manual, Rev. B