A RAID level 0 system is not a true member of the RAID family, because it does not include redundancy, that is, no redundant information is maintained.
It uses data striping to increase the I/O performance.
For RAID 0, the user and system data are distributed across all of the disk in the array, i.e. data are striped across the available disk.
If two different I/O requests are there for two different data block, there is a good probability that the requested blocks are in different disks. Thus, the two requests can be issued in parallel, reducing the I/O waiting time.
RAID level 0 is a low cost solution, but the reliability is a problem since there is no redundant information to retrieve in case of disk failure.
RAID level 0 has the best write performance of all RAID levels, because there is no need of updation of redundant information.