I have a Western Digital VelociRaptor 600GB Sata with the EVGA 4-Way SLi Classified motherboard. The issue I'm having which happens randomly. Sometimes it wont happen at all or it will happen frequently and the VelociRaptor will randomly quit being detected from the Mobo. This is the first time I've had this issue with a computer like this. Any ideas on how to resolve this issue?
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Try replacing the sata cable with a locking one and change the power cable to one of the others.