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RAID reconstruction is the process of redesigning and restoring a RAID drive or environment to normal working conditions after its data or drive configuration has been lost or corrupted.
A RAID reconstruction is also known as a RAID rebuild.
RAID reconstruction is primarily achieved through RAID recovery software that utilizes data recovery algorithms and parity data along with technical skills at the administrator's end. The RAID reconstruction process is different than a standard drive recovery or reconstruction process as data is usually backed up on one or more blocks on the disk drives or arrays.
RAID reconstructions typically require the same RAID controller and configuration that was previously in operation. The software is presented with the RAID reconstruction map that copies the data exactly on the same block and drives as it was stored previously.
However, if the headers on the disk are corrupted, termed faulty by the RAID controller and/or the BIOS configuration are unavailable; RAID reconstruction must be done manually.