Seagate CHEETAH 15K.5 SCSI ST3146855LC - Manual (Page 32)

26 Cheetah 15K.5 SCSI Product Manual, Rev. J
7.3 Power dissipation
ST3300655LW/ST3300655LC
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 13.1
watts (44.70 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.
)
Figure 3. ST3300655LC DC current and power vs. IOPS (LVD)
ST3300655LC CURRENT/POWER vs THROUGHPUT (SCSI - LVD)
Random 8 Block Reads
0.000
0.200
0.400
0.600
0.800
1.000
1.200
1.400
1.600
1.800
0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0 400.0
I/Os per Second
Ampe
re
s
0.00
2.00
4.00
6.00
8.00
10.00
12.00
14.00
16.00
18.00
Power (watts)
5Vo lt A
12 Vo lt A
Watts