Seagate ST300MM0026 Savvio 10K.1 SCSI Product Manual - Page 36

ST936701LC DC CURRENT/POWER vs THROUGHPUT Low Voltage Differential

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ST936701 For drives using single-ended interface circuits, typical power dissipation under idle conditions is 4.83 watts (16.5 BTUs per hour). For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 4.83 watts (16.5 BTUs per hour). To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see Figures 6 and 7). 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. ST936701LC DC CURRENT/POWER vs THROUGHPUT (Single Ended) Random 8 Block Reads 1.400 14.00 5Vo lt A 1.200 12.00 12 Volt A Watts 1.000 10.00 Amperes Power (watts) 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 Figure 8. ST936701 DC current and power vs. input/output operations per second (SE) Amperes ST936701LC DC CURRENT/POWER vs THROUGHPUT (Low Voltage Differential) Random 8 Block Reads 1.400 14.00 5Vo lt A 1.200 12.00 12 Volt A Watts 1.000 10.00 Power (watts) 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 Figure 9. ST936701 DC current and power vs. input/output operations per second (LVD) 30 Savvio SCSI Product Manual, Rev. D

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30
Savvio SCSI Product Manual, Rev. D
ST936701
For drives using single-ended interface circuits, typical power dissipation under idle conditions is 4.83 watts
(16.5 BTUs per hour).
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is
4.83
watts (16.5 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see
Figures 6 and 7). 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.
ST936701
DC current and power vs. input/output operations per second (SE)
Figure 9.
ST936701
DC current and power vs. input/output operations per second (LVD)
ST936701LC DC CURRENT/POWER vs THROUGHPUT (Single Ended)
Random 8 Block Reads
0.000
0.200
0.400
0.600
0.800
1.000
1.200
1.400
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
Power (watts)
5Volt A
12 Volt A
Watts
ST936701LC DC CURRENT/POWER vs THROUGHPUT (Low Voltage Differential)
Random 8 Block Reads
0.000
0.200
0.400
0.600
0.800
1.000
1.200
1.400
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
Power (watts)
5Volt A
12 Volt A
Watts