Seagate 15K.3 - Cheetah - Hard Drive, Product Manual

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26 Cheetah 15K.3 SCSI Product Manual, Rev. G
6.3 Power dissipation
ST373453
For drives using single-ended interface circuits, typical power dissipation under idle conditions is 12.2 watts
(41.6 BTUs per hour).
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 12.5
watts (42.7 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see
Figures 8 and 9). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the cor-
resp5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour,
multiply watts by 3.4123.
Figure 8. ST373453 DC current and power vs. IOPS (SE)
Figure 9. ST373453 DC current and power vs. IOPS (LVD)
ST373453LC/LW DC CURRENT/POWER vs THROUGHPUT (SE)
Random 8 Block Reads
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
I/Os per Second
Amp
e
res
4.00
6.00
8.00
10.00
12.00
14.00
16.00
18.00
Po
w
e
r (w
atts)
5Vo lt A
12 Vo lt A
Watts
ST373453LC/LW DC CURRENT/POWER vs THROUGHPUT (LVD)
Random 8 Block Reads
0.400
0.600
0.800
1.000
1.200
1.400
1.600
1.800
2.000
0.0 50.0 100.0 150.0 200.0 250.0 300.0 350.0
I/Os per Second
Am
p
e
re
s
4.00
6.00
8.00
10.00
12.00
14.00
16.00
18.00
20.00
Pow
e
r (w
atts)
5Vo lt A
12 Volt A
Watts