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Cheetah NS SAS Product Manual, Rev. B
25
Figure 19. Typical ST3400755SS drive +5V and +12V current profiles
6.3 Power dissipation
Typical power dissipation under idle conditions in 3Gb operation is 8.19 watts (27.95 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
20). 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.
Figure 20. ST3400755SS (3 Gbit) DC current and power vs. input/output operations per second
ST3400755SS CURRENT/POWER vs THROUGHPUT (SAS - 3 .0GB)
Random 8 Bloc k Reads
0.000
0.200
0.400
0.600
0.800
1.000
1.200
1.400
0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0
I/Os per Second
Amperes
0.00
2.00
4.00
6.00
8.00
10.00
12.00
14.00
Power (watts)
5Volt A
12 Vo lt A
Watts