Jan 18, 2012
A RAID 1 creates an identical copy (or mirror) of the data set across two or more disks. The RAID array capacity can only be as big as the smallest member disk. This reduces the overall capacity of the volume, but gives redundancy and increases the overall reliability. The typical RAID 1 setup uses two hard disk drives (see diagram below).
Typically there are several reasons RAID 1 data loss. Most common is file system corruption as identical data is written to both disks. For example, if the boot record or file table becomes corrupt due to invalid data being written to the array then both disks will be affected equally. A second common fault in RAID 1 array is if there is a power surge; this usually causes both drives to fail at the same time. It is usual to see a failed printed circuit board on each disk in the RAID 1 set.
When conducting data recovery on a RAID 1 volume we diagnose the array to find disk with the most minor fault, and recover data from this disk. This then allows Cheadle Data Recovery to offer the lowest possible price for the recovery of data.
Data spanned across the disks should be identical