This has been a long and very painful month... About a month ago I received my brand new 2.93GHZ 8 core MacPro tower with Apple Raid Card installed. I purchased 4 brand new Western Digital Velociraptors 10k 300GB drives to install in the 4 bays of the Mac. Bay 1 would contain the system drive and Bays 2-4 would be in a RAID5 configuration. After installing the drives and booting up I got a RAID Disk Failure message from the Apple RAID utility on Bay 3. I instantly thought I had a bad Hard Drive so I shut down the system and swapped drives 3 and 4 to see if that drive would fail in Bay 4. Upon bootup the drive in Bay 3 failed again. Curious... I called Apple Care and they sent an on site tech guy to replace my RAID card with a brand new one. After installation the exact same problem occured... The drive in Bay 3 failed. It was then decided that I must have a bad SATA connection on the Logic Board and they would swap out my old Mac for a new Mac Pro. Great!!! I was happy with the Apple care people and felt confident that this would remedy the problem... Unfortunately my RMA fell through the cracks and I ended up getting my new mac 3 weeks later..... Well yesterday I received the new mac and installed the four drives, booted up and everything was perfect... I then created a 3 drive RAID 5 with bays 2-4 and it worked swimmingly.... Until I rebooted... Guess what reared its ugly head... Bay 3 had failed to boot and my raid was broken again... So here is where it gets tricky... I powered down then took the stock Hitachi hard drive that came with the mac and put it into bay 3. So i have 3 WD Raptors (no OS) in bays 1 2 and 4 and the Mac system drive in bay 3. I restart the computer and it tells me that Bay 2 has failed to launch...GEESH!! So I then pull all drives out and place the WD raptor with the OS in bay 1 and test the other 3 drives individually in bay 2 and they all boot up fine. Apple blames Western Digital and Western Digital blames Apple of course... Western Digital only ahs diagnostic software that runs on PC and will only replace my drives with refurbs (not cool in my book) and I have already replaced 3 raid cards and 2 mac pros... I cant return drives since its over 30 days cuz I was waiting on my new mac to come in... So as a man at his wits end and not wanting to eat the 929.00 dollars in Hard drives begs and pleads to this board if they have any insight or ideas? Pretty Please???