Causes of Raid Failure
While RAID configurations have higher redundancy and fault tolerance, in many cases, one disk failure can affect the entire configuration. Your array can experience data loss due to a variety of scenarios. Common types of RAID failures include:
Inadvertent data deletion
Formatted Partitions
Virus Infection
File System Corruption
Controller Failure
Incorrect RAID rebuilds
Single or Multiple Drive Failures
Power Surge
What NOT to Do
Never run software on a failed drive and never attempt to replace physically damaged components. As soon as you notice any failure symptoms, turn your hard disk drive off and contact a professional data recovery company.