siiiiigh, that's a real shame, my agility 2 is still happily running after quite some time.
I'm really not comfortable with handing over a storage device without first having a way to wipe the contents. I don't suppose there is anyway to physically do this without breaking the warranty? If it costed a little less I wouldn't even consider handing it back, I'd just buy a new one...
there are some issues with the newest sata chipsets, OROM's, and ACPI tables not getting along with the Sandforce 6G controllers. If you had used the newest 2.09 firmware that came out you may have avoided this problem. Going to the vendor for a swap would be the easiest method or RMA is pretty quick as mentioned above as well. Usually 1 week or so back to your doorstep is typical.
As for the data?.. well.. that's up to you but I will say this. If the drive is panic locked completely and will not be visable in the bios detection?.. then they will not be able to pick it up on any other equipment either. The ONLY way to put the drive back online would be for them to open it and apply an engineering flash to the controller. It is of destructive nature and does NOT permit them to just bring it back and allow them to access your data.
This is not speculation as I have spoken personally with OCZ support reps(I beta test for OCZ) and have been told exactly what the process involved is all about. Can't say much more than that for specific detail but hopefully you get the idea that they have no access if the controller is locked. If it's locked?.. it's locked. Plain and simple.
Here's the last ditch effort I would try before return/RMA. Can't go into much more basic detail without specific hardware being used but this is standard advise over at OCZ forum.
1. remove power for at least 1 hour to drain residual energy.
2. reset the mobo cmos and try in ide mode. then ahci and raid as well.
3. try another sata chip if you have one available or better yet another system altogether.
If no detection is possible? the drive is panic locked. It is NOT dead and engineering mode destructive firmware flash will bring it back. However,.. they will toss it into a bin and send you a completely new drive. You'll probably get the latest firmware already flashed?.. but be sure to check and update to 2.09 if not already running with it. Good Luck
PS. if you did actually get lucky and detect the drive again?.. you MUST secure erase and update to the newest firmware before proceeding to use the drive. If you get lucky to access your data?.. then get it quickly and DO NOT SLEEP or use the drive for any longer than needed to recover it.