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Cheetah 15K.4 FC Product Manual, Rev. B 33
ST336854FC
Typical power dissipation under idle conditions in 2Gb operation is 9.88 watts (33.7 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.
Figure 10. ST336854FC DC current and power vs. input/output operations per second
ST336754FC Specification random 8 block read
0.000
0.200
0.400
0.600
0.800
1.0 0 0
1.2 0 0
1.4 0 0
1.6 0 0
1.8 0 0
0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0
I/Os per Second
Amperes
0.00
2.00
4.00
6.00
8.00
10 .0 0
12 .0 0
14 .0 0
16 .0 0
18 .0 0
Power (watts)
5Volt A
12 V o l t A
Watts