Filter
Top Products
CHEETAH 15K.7 SAS PRODUCT MANUAL, REV. F 24
300GB model
Typical power dissipation under idle conditions in 6Gb operation is 8.71 watts (29.72 BTUs per hour).
To obtain operating power for typical random read operations, refer to the following I/O rate curve (see Figure 4). 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 6. ST3300657SS DC current and power vs. input/output operations per second
6.4 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).
6.4.1 Temperature
a. Operating
The maximum allowable continuous or sustained HDA case temperature for the rated Annualized Failure Rate (AFR) is
122°F (50°C) The maximum allowable HDA case temperature is 60°C. Occasional excursions of HDA case temperatures
above 122°F (50°C) or below 41°F (5°C) may occur without impact to the specified AFR. Continual or sustained operation
at HDA case temperatures outside these limits may degrade AFR.
Provided the HDA case temperatures limits are met, 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 68°F (20°C) per hour. Air flow may be needed
in the drive enclosure to keep within this range (see Section 8.3). Operation at HDA case temperatures outside this range
may adversely affect the drives ability to meet specifications. To confirm that the required cooling for the electronics and
HDA case is provided, place the drive in its final mechanical configuration, perform random write/read operations and
measure the HDA case temperature after it has stabilized.
b. Non-operating
–40° to 158°F (–40° to 70°C) package ambient with a maximum gradient of 68°F (20°C) per hour. This specification
assumes that the drive is packaged in the shipping container designed by Seagate for use with drive.