Seagate ST318452LC Manual download pdf (Page 35)

Cheetah X15 36LP Product Manual, Rev. D 25

6.3 Power dissipation

ST336752 and

ST336732

For drives using single-ended interface circuits, typical power dissipation under idle conditions is 12.1 watts

(41.3 BTUs per hour).

For drives using low voltage differential interface circuits, typical power dissipation under idle conditions is 12.3

watts (42.0 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 6. ST336752 and ST336732 DC current and power vs. IOPS (SE)

Figure 7. ST336752 and ST336732 DC current and power vs. IOPS (LVD)

1.800

0 50 100

I/Os per Second

Amperes

150 300

0.400

0.600

0.800

1.000

6.0

Watts

8.0

10.0

12.0

1.200

1.600

1.400

200 250

5V A

12V A

Watts

4.0

14.0

16.0

1.800

0 50 100

I/Os per Second

Amperes

150 300

0.400

0.600

0.800

1.000

4.0

Watts

6.0

8.0

10.0

1.200

1.600

1.400

200 250

5V A

12V A

Watts

12.0

14.0

16.0

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Seagate ST318452LC Manual Page 35

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