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What is RAID 6?

RAID 6 is an extension beyond RAID 5 because it allows up to two disks to fail before data becomes irrecoverable. Data is striped across several disks and dual parity is used to store and recover data. RAID 6 requires a minimum of four disks and a maximum of 16 disks. RAID 6 is similar to RAID 5 but includes a second parity scheme that is distributed across different disks.

The capacity of a RAID 6 is the smallest hard drive capacity muliplied by the number of disks in the array minus two disks for parity.

 
     
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