Power Dissipation; Figure 8. St3146854Fc Dc Current And Power Vs. Input/Output Operations Per Second - Seagate 15K.4 - Cheetah - Hard Drive Product Manual

6.3

Power dissipation

ST3146854FC
Typical power dissipation under idle conditions in 2Gb operation is 13.96 watts (47.6 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.
ST3146854FC DC CURRENT/POWER vs THROUGHPUT (2 Gb)
1 .800
1 .600
1 .400
1 .200
1 .000
0.800
0.600
0.400
0.0 50.0 1 00.0
Figure 8. ST3146854FC DC current and power vs. input/output operations per second
30
Random 8 Block Reads
1 50.0 200.0 250.0
I/Os per Second
20.00
1 8.00
1 6.00
1 4.00
1 2.00
1 0.00
8.00
6.00
4.00
300.0 350.0 400.0
Cheetah 15K.4 FC Product Manual, Rev. C
5Vo lt A
1 2 Vo lt A
Watts