Seagate 146.8GB HD ST3146854LW User Manual
Product codes
ST3146854LW
Cheetah 15K.4 SCSI Product Manual, Rev. B
31
6.3
Power dissipation
ST3146854
For drives using single-ended interface circuits, typical power dissipation under idle conditions is 11.91 watts
(40.64 BTUs per hour). For drives using low voltage differential interface circuits, typical power dissipation
under idle conditions is 11.91 watts (40.64 BTUs per hour).
(40.64 BTUs per hour). For drives using low voltage differential interface circuits, typical power dissipation
under idle conditions is 11.91 watts (40.64 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.
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.
ST3146854
DC current and power vs. IOPS (SE)
Figure 9.
ST3146854 DC current and power vs. IOPS (LVD)
ST3146854LC DC CURRENT/POWER vs THROUGHPUT (Single Ended)
Random 8 Block Reads
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
350.0
400.0
I/Os per Second
Am
p
e
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s
4.00
6.00
8.00
10.00
12.00
14.00
16.00
18.00
Pow
e
r (w
atts)
5Vo lt A
12 Vo lt A
Watts
ST3146854LC DC CURRENT/POWER vs THROUGHPUT (Low Voltage Differential)
Random 8 Block Reads
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
350.0
400.0
I/Os per Second
Am
p
e
re
s
4.00
6.00
8.00
10.00
12.00
14.00
16.00
18.00
Pow
e
r (w
atts)
5Vo lt A
12 Vo lt A
Watts