It is not that difficult to work out if the hard drive has failed or crashed. Here are some of the symptoms of hard disk failures:
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Hard disk cannot be recognized or detected by your system
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System boot failure or the system hangs in the midst of booting
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The hard drive does not spin
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The hard drive cannot be detected by System BIOS
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Noise/clicking sounds from the system
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Frequent locking up while booting
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Files vanishing suddenly and multiple times at that
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Freezing of the computer and no keyboard/mouse inputs in such situations
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Opening or saving files becomes a slow and tedious affair
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Higher number of bad sectors while the chkdsk command is run
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Computer performance cannot be improved even after optimization
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Jostled/bumped computer while it is running
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Unusual heating up of the computer
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Failure of electric motor which enables the platter to spin on account of poor components or bearings
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Air intake filter becomes clogged up or dysfunctional
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Sudden power failures while disk is writing
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Considerable heat which leads to failure of the electronic circuit board
