Seagate Cheetah X15, Product Manual

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26 Cheetah X15 Product Manual, Rev. C
ST39251
For drives using single-ended interface circuits, typical power dissipation under idle conditions is 10.32 watts
(35.2 BTUs per hour).
For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 10.7
watts (36.6 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following two I/O rate curves (see
Figures 7 and 8). Locate the typical I/O rate for a drive in your system on the horizontal axis and read the cor-
resp5 volt current, +12 volt current, and total watts on the vertical axis. To calculate BTUs per hour,
multiply watts by 3.4123.
Figure 9.
ST39251
DC current and power vs. input/output operations per second (SE)
Figure 10.
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DC current and power vs. input/output operations per second (LVD)
1.800
0 50 100
I/Os per Second
Amperes
150 300
0.400
0.600
0.800
1.000
11
17
Watts
13
15
1.200
1.600
1.400
200 250
5V A
12V A
Watts
1.800
0 50 100
I/Os per Second
Amperes
150 300
0.400
0.600
0.800
1.000
11
17
Watts
13
15
1.200
1.600
1.400
200 250
5V A
12V A
Watts