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Chapter 16. Troubleshooting and Recoveri... > Understanding Disk Diagnostics

Understanding Disk Diagnostics

A hard disk can suddenly bite the dust thanks to a lightning strike, an accidental drop from a decent height, or an electronic component shorting out. However, most of the time hard disks die a slow death. Along the way, hard disks almost always show some signs of decay, such as the following:

  • Spin-up time gradually slows

  • Drive temperature increases

  • The seek error rate increases

  • The read error rate increases

  • The write error rate increases

  • The number of reallocated sectors increases

  • The number of bad sectors increases

  • The cyclic redundancy check (CRC) produces an increasing number of errors


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