Power Dissipation - Seagate Cheetah NS 10K Product Manual

6.3

Power dissipation

ST3400755FC
Typical power dissipation under idle conditions in 4 Gbit operation is 8.1 watts (27.64 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
3). 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.
ST3400755 CURRENT/POWER vs THROUGHPUT (FC - 4GB)
1 .400
1 .200
1 .000
0.800
0.600
0.400
0.200
0.000
0.0 50.0
Figure 3. ST3400755FC DC current and power vs. input/output operations per second at 4 Gbit
28
Random 8 Block Reads
1 00.0 1 50.0 200.0
I/Os per Second
1 4.00
1 2.00
1 0.00
8.00
6.00
4.00
2.00
0.00
250.0 300.0 350.0
Cheetah NS FC Product Manual, Rev. A
5Volt A
1 2 Volt A
Watts