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Hard Drive Failure and Data loss due to exceeding Hard Drive temperature!
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Hard Drive Reliability

Heat has a major effect on drive reliability.
Disk drives are complex electro-mechanical devices that can suffer performance degradation or failures due to a single event or a combination of events occurring over time. Environmental conditions that affect drive reliability include ambient temperature, cooling air flow rate, voltage, duty cycle, rpm, shock, vibration, and relative humidity. Fortunately, it is possible to predict certain types of failures by measuring environmental conditions. One of the worst enemies of hard disk drives is heat. Within a drive, the reliability of both the electronics and the mechanics (such as the spindle motor and actuator bearings) degrades as temperature rises. Running any disk drive at extreme temperatures for prolonged periods of time is detrimental and can eventually lead to permanent data loss.

Heat can build up within computer systems due to a clogged fan, failure of air conditioning in a room, operating more drives than the cooling system can handle, and so on. Unfortunately, these conditions can go completely unnoticed until a failure occurs. Because of the essential nature of today's workstations and servers, such risks are unacceptable for many users. What is needed is a way to identify high-temperature situations before they affect data integrity. HDData is the solution ! HDData has specially designed to identify the high temperatures.
HDData will warn you and HDData will take actions for you.

The figure above shows the dramatic effect that temperature has on the overall reliability of a hard disk drive. Derivations from a nominal operating temperature (assumed to be maintained over the life of a drive) can result in a derivation from the nominal failure rate. As the temperature exceeds the recommended level, the failure rate increases two to three percent for every one degree C rise above it. For example, a hard disk drive running for an extended period of time at five degrees above the recommended temperature can experience an increase in failure rate of 10 to 15 percent. Likewise, operating a drive below the recommended temperature can extend drive life.

S.M.A.R.T.
For the complete and best information go to the S.M.A.R.T. wikipedia. Click here.