this is from G4
While it's not unusual to get a hard drive that doesn't work on arrival, or fails within the first few months, most hard drives should last about 4 to 6 years. In a laboratory setting, hard drives have a Mean Time Between Failures (MTBF) of 300,000 hours. That means, when 1,000 hard drives are run continuously, one fails every 300,000 hours. But the MTBF isn't a very accurate gauge of a hard drive's real-world lifespan.
Remember that your hard drive is a delicate mechanism, complete with bearings and moving parts-- just like any household appliance. Any unusual noises coming from your hard drive could be a sign that it's failing.
The top three things that will kill your hard drive are:
1. Overuse (such as defragging your hard drive every day)
2. Overheating due to lack of ventilation
3. Electrical shocks-- get a surge protect
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