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Raid Recovery

Raid recovery is a specialist type of data recovery service. RAID is an acronym of Redundant Array of Inexpensive Drives and consists of at least two drives that are configured as a single volume or container. The most common forms of RAID are described below.

RAID 0 requires a minimum of two drives that gives the full disk size of both drives as a single volume the data is stored in stripes each stripe consisting of a block of data on each drive block sizes are typically 64kb but we have block sizes from 4kb to 2 Mb in size. This is the cheapest type of RAID but has no redundancy. If one drive fails, then access to all data on both drives is lost.

RAID 1 Requires 2 drives the second drive is an identical copy of the first drive meaning that you only get the equivalent of one drive for the price of two. Expensive but offers redundancy so one drive can fail and you can still access the data on the second drive.

RAID 5 Requires a minimum of three drives. Is similar to RAID 0 in terms of blocks and stripes, but each stripe contains a parity block that 'rotates' its position for each stripe. For each raid array, the equivalent of one drive is used for parity so if you have 3 drives, then you have the capacity of 2 drives available, if you have 4 drives, then you have the capacity of 3. If one drive fails in the array, the data is still accessible, albeit slower than normal as the data from the missing drive is recalculated using the parity XOR system.


RAID Recovery by MjM Data Recovery

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