Mike has an older Sony Vaio and he changed out the hard drives. He keeps getting RAID Errors, and he doesn't even use a RAID at all. Leo says that's clearly an error as the BIOS may believe that the desktop is working as a RAID. Leo recommends going into the BIOS to make sure the disc interface isn't set to RAID. If it is, the errors will occur. Look for AHCI (advanced host controller interface). That's the mode he'll want to be in.
The chatroom says that Sony VAIOs are set to RAID by default. This article on HowToGeek explains how to fix that.