Originally Posted by 2007fld
So with a RAID system, the storage capacity is one half of the real hard disk size?
Not really. Actually if you have N disks and the smaller one has size S, the total size of the array will be
Raid 5 distributes the parity information through disks. Parity information uses an exclusive OR mechanism: it stores one extra bit to reconstruct data if one or more bits are lost. You can find a good and simple explanation here
. Due to this setup if a disk is lost you can recover all data, if two disk fail simultaneously all data are lost: it is a compromise between the advantages of striping and a certain degree of redundancy.