Seagate CHEETAH ST373207LW/LC - Manual (Page 41)

Cheetah 10K.7 SCSI Product Manual, Rev. D 31
6.3 Power dissipation
ST3300007
For drives using single-ended interface circuits, typical power dissipation under idle conditions is 10.14 watts
(34.60 BTUs per hour).
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is
10.14 watts (34.60 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-
responding +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour,
multiply watts by 3.4123.
Figure 8. ST3300007 DC current and power vs. input/output operations per second (SE)
Figure 9. ST3300007 DC current and power vs. input/output operations per second (LVD)
ST3300007LC DC CURRENT/POWER vs THROUGHPUT (SE) 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
I/Os per Second
Amp
e
re
s
0.00
2.00
4.00
6.00
8.00
10.00
12.00
14.00
16.00
18.00
P
o
wer (watts)
5Vo lt A
12 Vo lt A
Watts
ST3300007LC DC CURRENT/POWER vs THROUGHPUT (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
I/Os per Second
Amp
e
re
s
0.00
2.00
4.00
6.00
8.00
10.00
12.00
14.00
16.00
18.00
P
o
we
r (wa
tts
)
5Vo lt A
12 Vo lt A
Watts