This is the simplest RAID Level, the fastest and
most storage efficient configuration of a group
of disks, but it has no fault tolerance. Files
are broken into stripes of a size dictated by
the user-defined stripe size of the array, and
stripes are sent to each disk in the array if
one drive fails the whole array fails. As there
is no parity, it offers the best storage efficiency.
The striping allows read/write operations to occur
simultaneously on each disk for speed. This is
most popular RAID Level for performance seekers.
If you are having problem with RAID
O, the chances are that one of the drives used
in the Array have physical problem. At this point,
we suggest to shut the server down and get the
professional help. Trying to recover data that
this point may do more harm to the problematic
drive and may lesson the chances of data recovery.