Seagate ST9300603SS ユーザーズマニュアル
30
Savvio 10K.3 SAS Product Manual, Rev. G
146GB models in 6 Gbit operation
Typical power dissipation under idle conditions in 6Gb operation is 3.48 watts (11.87 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure
19). 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.
19). 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 22.
146GB (at 6 Gbit) DC current and power vs. input/output operations per second
7.4
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). Maximum wet bulb temperature is 82°F (28°C).
any drive part. Altitude and atmospheric pressure specifications are referenced to a standard day at 58.7°F
(14.8°C). Maximum wet bulb temperature is 82°F (28°C).
7.4.1
Temperature
a. Operating
With cooling designed to maintain the case temperatures, the drive meets all specifications over a 41°F to
131°F (5°C to 55°C) drive ambient temperature range with a maximum temperature gradient of 20°C per
hour. The enclosure for the drive should be designed such that these temperatures not exceeded. Air flow
may be needed to achieve these temperature values (see Section 11.2). Operation at case temperatures
above these values may adversely affect the drives ability to meet specifications.
131°F (5°C to 55°C) drive ambient temperature range with a maximum temperature gradient of 20°C per
hour. The enclosure for the drive should be designed such that these temperatures not exceeded. Air flow
may be needed to achieve these temperature values (see Section 11.2). Operation at case temperatures
above these values may adversely affect the drives ability to meet specifications.
The MTBF specification for the drive is based on operating in an environment that ensures that the case
temperatures are not exceeded. Occasional excursions to drive ambient temperatures of 131°F (55°C) or
41°F (5°C) may occur without impact to specified MTBF. Air flow may be needed to achieve these tempera-
tures. Continual or sustained operation at case temperatures above these values may degrade MTBF. The
maximum allowable continuous or sustained HDA case temperature for the rated MTBF is 122°F (50°C).
temperatures are not exceeded. Occasional excursions to drive ambient temperatures of 131°F (55°C) or
41°F (5°C) may occur without impact to specified MTBF. Air flow may be needed to achieve these tempera-
tures. Continual or sustained operation at case temperatures above these values may degrade MTBF. The
maximum allowable continuous or sustained HDA case temperature for the rated MTBF is 122°F (50°C).
To confirm that the required cooling for the electronics and HDA is provided, place the drive in its final
mechanical configuration, perform random write/read operations. After the temperatures stabilize, measure
the case temperature of the drive.
mechanical configuration, perform random write/read operations. After the temperatures stabilize, measure
the case temperature of the drive.