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6.4
Power Dissipation
4000GB models in 12Gb operation
Typical power dissipation under idle conditions in 12Gb operation is 9.13 Watts (31.16 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 2). Locate the typical I/O rate
for a drive in the 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 2.
4000GB (at 12Gb) DC current and power vs. input/output operations per second
6.5
Environmental limits
Temperature and humidity values experienced by the drive must be such that condensation does not occur on any drive part. Altitude and
atmospheric pressure specifications are referenced to a standard day at 58.7°F (14.8°C).
Note
To maintain optimal performance drives should be run at nominal drive temperature and humidity
6.5.1
Temperature
a. Operating
The drive meets the operating specifications over a 41°F to 140°F (5°C to 60°C) drive temperature range with a maximum
temperature gradient of 36°F (20°C) per hour.
The maximum allowable drive temperature is 140°F (60°C).
Air flow may be required to achieve consistent nominal drive temperature values (see Section 9.2). To confirm that the required
cooling is provided for the electronics and HDA, place the drive in its final mechanical configuration, and perform random write/
read operations. After the temperatures stabilize, read drive temperature from Temperature Log Page (0Dh).
b. Non-operating
–40° to 158°F (–40° to 70°C) package ambient with a maximum gradient of 36°F (20°C) per hour. This specification assumes that
the drive is packaged in the shipping container designed by Seagate for use with drive.
Seagate Enterprise Performance - 3.5 HDD SAS Product Manual, Rev. B
Current/Power vs Throughput (SAS - 12.0GB)
Random 4KN Block Reads
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