Seagate ST3146855LC - Cheetah 146.8 GB Hard Drive Product Manual page 34

ST3146855LW/ST3146855LC
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is
10.39 watts (35.45 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
4). 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.
ST3146855LC CURRENT/POWER vs THROUGHPUT (SCSI - LVD)
1 .800
1 .600
1 .400
1 .200
1 .000
0.800
0.600
0.400
0.200
0.000
0.0 50.0
Figure 4. ST3146855LC DC current and power vs. IOPS (LVD)
28
Random 8 Block Reads
1 00.0 1 50.0 200.0
I/Os per Second
250.0 300.0 350.0
Cheetah 15K.5 SCSI Product Manual, Rev. H
5Vo lt A
1 8.00
1 2 Volt A
1 6.00 Watts
1 4.00
1 2.00
1 0.00
8.00
6.00
4.00
2.00
0.00
400.0