ok first off mate, we need more info, when had this happend ?? Have u been running the sytem for sometime then this has just happend or have u tryed setting your machine up as a raid???

If you can most abit more info i'll help u out.Just so u know what raid 0 is if ur setting it up it anit great if u love ur data.

RAID 0 (striped disks) distributes data across several disks in a way which gives improved speed and full capacity, but all data on all disks will be lost if any one disk fails