Seagate ST373207LC Cheetah 10K.7 SCSI Product Manual - Page 41

Power dissipation

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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 corresponding +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour, multiply watts by 3.4123. Amperes ST3300007LC DC CURRENT/POWER vs THROUGHPUT (SE) Random 8 Block Reads 1.800 18.00 1.600 16.00 1.400 14.00 1.200 12.00 1.000 10.00 0.800 8.00 0.600 6.00 0.400 4.00 0.200 2.00 0.000 0.0 0.00 50.0 100.0 150.0 200.0 250.0 300.0 I/Os per Second Power (watts) 5Vo lt A 12 Vo lt A Wat t s Figure 8. ST3300007 DC current and power vs. input/output operations per second (SE) Amperes ST3300007LC DC CURRENT/POWER vs THROUGHPUT (LVD) Random 8 Block Reads 1.800 18.00 1.600 16.00 1.400 14.00 1.200 12.00 1.000 10.00 0.800 8.00 0.600 6.00 0.400 4.00 0.200 2.00 0.000 0.0 0.00 50.0 100.0 150.0 200.0 250.0 300.0 I/Os per Second Power (watts) 5Vo lt A 12 Vo lt A Watts Figure 9. ST3300007 DC current and power vs. input/output operations per second (LVD) Cheetah 10K.7 SCSI Product Manual, Rev. D 31

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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
Amperes
0.00
2.00
4.00
6.00
8.00
10.00
12.00
14.00
16.00
18.00
Power (watts)
5Volt 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
Amperes
0.00
2.00
4.00
6.00
8.00
10.00
12.00
14.00
16.00
18.00
Power (watts)
5Volt A
12 Vo lt A
Watts