Once in a while I come across a PC with RAID0. This is a 2 disk array with striping - the data is interleaved between 2 hard drives and neither drive has all the data. There must have been a reason for this in the past but in my experience it can cause a lot of problems without any benefits. If the PC won't boot and defies all efforts to be revived, it is very difficult to recover data. With RAID1 (mirrored) or without RAID, I can usually recover data by connecting the drive to another PC with an external enclosure and then either drag and drop files as needed or run a relatively inexpensive data recovery software. With RAID0 only a data recovery specialist with a bench full of equipment can get at the data. The cost goes from the $100-200 range to the $500-$1,000 range.