I have a dell pc. Two hard drives together set up as RAID. One hard drive has Error Occurred (0) next to it when booting up and the PC does not boot up it stops there and says something like cannot read disc press ctrl + alt + del to restart. Also what is interesting when I launch up the intel pentium sign as extreme next to it. I was never on the xtreme version.
First check each drive with the manufacturers drive testing program. get the one that is the bootable DOS ISO and use ISO Recorder, or other ISO burning software, to burn the ISO to CD. If both drives are good, then you can follow SomeJoe7777's advice on recovering the data. I have never done it, because I don't RAID, and it will cost some cash, but it is the cheapest way out if you really need the data.
Always back up your data, especially if you are using RAID0. I guess you learned that the hard way.