Dell Precision 330 - Manual (Page 69)

9. Remove the thermal sensor from the clip in the front wall of the chassis.
The hard-drive thermal sensor is mounted on the chassis frame where the hard-drive bracket is installed.
10. Lift the thermal sensor and sensor cable away from the chassis.
Removing the Hard-Drive Thermal Sensor (Mini Tower Chassis)
Replacing the Hard-Drive Thermal Sensor (Mini Tower Chassis)
To replace the hard-drive thermal sensor, perform the removal procedure in reverse.
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NOTE: When mounting the hard-drive thermal sensor in the clip in the front wall of the chassis, ensure that the sensor cable is oriented toward the front wall of
the chassis.