Potential Causes of RAID Server Failure or Degraded Array
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Incompatible hard drives added to your RAID array.

Hardware conflicts.

Software, configuration or operating system corruption.

Virus infection, software or operating system upgrade.

RAID controller failure or incorrect configuration changes.

Multiple hard drives fail or go offline in your RAID Array .

RAID Server crashed and won't remount array or volume(s).

Your RAID configuration gets damaged or becomes corrupt.