Seagate ST373207LC Cheetah 10K.7 SCSI Product Manual - Page 42

responding +5 volt current, +12 volt current, and total watts on the vertical axis. To calculate

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ST3146707 For drives using single-ended interface circuits, typical power dissipation under idle conditions is 7.74 watts (26.41 BTUs per hour). For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 7.74 watts (26.41 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 ST3146707LC 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 Watts Figure 10. ST3146707 DC current and power vs. input/output operations per second (SE) Amperes ST3146707LC 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 Wat t s Figure 11. ST3146707 DC current and power vs. input/output operations per second (LVD) 32 Cheetah 10K.7 SCSI Product Manual, Rev. D

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32
Cheetah 10K.7 SCSI Product Manual, Rev. D
ST3146707
For drives using single-ended interface circuits, typical power dissipation under idle conditions is 7.74 watts
(26.41 BTUs per hour).
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 7.74
watts (26.41 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 10.
ST3146707
DC current and power vs. input/output operations per second (SE)
Figure 11.
ST3146707
DC current and power vs. input/output operations per second (LVD)
ST3146707LC 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
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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 Volt A
Watts
ST3146707LC 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
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1.800
0.0
50.0
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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