RAID serves for two data storage requirements

1]Reliability

2]Performance

->Reliability-It maintains multiple copies of same data in

array of disks to make the storage fault tolerant in case of

disk failure.

->Performance-Different bits of a data component is stored

across an array of disks(bit striping) so that access time

is greatly reduced since single read time is enough to read

all the bits since they are in different disks, thus

boosting the performance.