Specifications

Cheetah 15K.4 SAS Product Manual, Rev. B 33
ST336754SS in 3 Gbit operation
Typical power dissipation under idle conditions in 3Gb operation is 10.33 watts (35.25 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 12. ST336754SS (3 Gbit) DC current and power vs. input/output operations per second
ST336754SS in 1.5 Gbit operation
Typical power dissipation under idle conditions in 1.5 Gbit operation is 10.63 watts (36.27 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.
Figure 13. ST336754SS (1.5 Gbit) DC current and power vs. input/output operations per second
ST336754SS DC CURRENT/POWER vs THROUGHPUT (3 Gbit)
Random 8 Block Reads
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
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
ST336754SS DC CURRENT/POWER vs THROUGHPUT (1.5 Gbit)
Random 8 Block Reads
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
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