Seagate Cheetah ST3146807LW, Product Manual

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Cheetah 10K.6 SCSI Product Manual, Rev. D 27
ST373307
For drives using single-ended interface circuits, typical power dissipation under idle conditions is 8.4 watts
(28.7 BTUs per hour).
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 8.7
watts (29.7 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 10.
ST373307
DC current and power vs. input/output operations per second (SE)
Figure 11.
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DC current and power vs. input/output operations per second (LVD)
ST373307 DC CURRENT/POWER vs THROUGHPUT (Single Ended)
Random 8 Block Reads
0.200
0.400
0.600
0.800
1.000
1.200
1.400
1.600
0.0 50.0 100.0 150.0 200.0 250.0 300.0
I/Os per Second
Am
p
e
re
s
2.00
4.00
6.00
8.00
10.00
12.00
14.00
16.00
Pow
e
r (w
atts)
5Vo lt A
12 Vo lt A
Watts
ST373307 DC CURRENT/POWER vs THROUGHPUT (Low Voltage Differential)
Random 8 Block Reads
0.200
0.400
0.600
0.800
1.000
1.200
1.400
1.600
0.0 50.0 100.0 150.0 200.0 250.0 300.0
I/Os per Second
Am
p
e
re
s
2.00
4.00
6.00
8.00
10.00
12.00
14.00
16.00
Pow
e
r (w
a
tts
)
5Vo lt A
12 Vo lt A
Watts