Figure 10. St336753 Dc Current And Power Vs. Iops (Se); Figure 11. St336753 Dc Current And Power Vs. Iops (Lvd) - Seagate ST373453LC - Cheetah 73.4 GB Hard Drive Product Manual

Cheetah 15K.3 SCSI Product Manual, Rev. G
ST336753
For drives using single-ended interface circuits, typical power dissipation under idle conditions is 10.3 watts
(35.1 BTUs per hour).
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 10.5
watts (35.8 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see
Figures 10 and 11). 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.
1 .800
1 .600
1 .400
1 .200
1 .000
0.800
0.600
0.400
0.0
Figure 10. ST336753 DC current and power vs. IOPS (SE)
1 .800
1 .600
1 .400
1 .200
1 .000
0.800
0.600
0.400
0.0
Figure 11. ST336753 DC current and power vs. IOPS (LVD)
ST336753LC/LW DC CURRENT/POWER vs THROUGHPUT (SE)
Random 8 Block Reads
50.0 1 00.0 1 50.0
I/Os per Second
ST336753LC/LW DC CURRENT/POWER vs THROUGHPUT (LVD)
Random 8 Block Reads
50.0 1 00.0 1 50.0
I/Os per Second
200.0 250.0 300.0
200.0 250.0 300.0
1 8.00
5Vo lt A
1 2 Vo lt A
1 6.00
Watts
1 4.00
1 2.00
1 0.00
8.00
6.00
4.00
350.0
1 8.00
5Vo lt A
1 2 Vo lt A
1 6.00
Watts
1 4.00
1 2.00
1 0.00
8.00
6.00
4.00
350.0
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