What's hooked up how? SATA, IDE, what have you... If the CD is SATA, are you using a MOLEX to SATA power adapter? These are often defective, and, even worse, generally intermittent, i.e., twist it one way - works fine, twist it a bit differently - voila - drive gone! Explain better what you mean by 'never downloaded the SATA RAID'? Do you have RAIDed SATA drives?