34 Constellation ES Series SAS Product Manual, Rev. F

500GB models in 3Gb operation

Please refer to Table 2 for power dissipation numbers.

To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure

8). 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.

Figure 8. 500GB models (3Gb) DC current and power vs. input/output operations per second
Note. For power details about SED vs. non-SED drive, please refer to section 7.8.
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ST3500414SS CURRENT /PO WER vs TH ROUGHP UT (SAS - 3.0GB)

Random 8 Block Rea ds

5Volt A
12 Volt A
Watts