Ultrastar 7K2
HGST Hard Disk Drive
Technical Reference Manual
17
Temperature and Humidity
Temperature & Humidity
Operating ambient temperature
1
5C to 60C
Max base casting temperature
2
60C
S.M.A.R.T. temperature value reported within ±3°C
Humidity 5-95% RH non-condensing
30C (maximum wet bulb)
Thermal Gradient
20C/hour (maximum)
Humidity Gradient 20%/hour (maximum)
Non-operating Temperature
-40C to 70C
Humidity 5-95% RH non-condensing
35C (maximum wet bulb) for up to 21 days
3
Thermal Gradient
30C/hour (maximum)
Humidity Gradient 20%/hour (maximum)
1
Ambient temperature is defined as the temperature of the environment immediately surrounding the drive.
The system environment must allow sufficient air flow to limit maximum surface temperatures as defined.
2
See Figure 2 Actual drive case temperature should be below 60°C and within the 5-60°C operating
ambient temperature.
3
Unless still in HGST’s factory sealed bag which allows up to 40C without limit.
Temperature Measurement
Drive component temperatures measured at the drive baseplate thermocouple location must remain within
the limits specified in Table 4. Figure 2 shows the temperature measurement location. Sustained operation
at temperatures in excess of the reliability values degrades the MTBF rating. Short excursions up to, but not
exceeding, the maximum values will not affect the MTBF rating. Maximum component temperature ratings
must not be exceeded under any operating condition, or product warranty will be void.
Table 4 Maximum and Reliability Operating Temperature Limits (Drive Baseplate)
Component Location Maximum
Reliability
1
Drive baseplate See Figure 2 60°C (140°F) 40°C
1
Sustained operation at temperatures in excess of the reliability values degrades the MTBF rating.
Figure 2 Drive Base Casting Thermocouple Location
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