Switching a HD from "transfer only" to "record mode"

[BretFarewell]

I have a 2 TB simpletech HD I bought right after christmas. I was told that if I formatted the drive with RAID 32 I would be able to use it for both a mac and a PC. (I rarely use my PC anymore but wanted the option). However, the drive is recognized as being "transfer only" and when I open up the window settings in PT8 to switch it to "record mode" it won't let me. Is it because of how I formatted the drive? If not then does anybody know how I can switch the drive over to "record mode"? If need be I can re-format the drive again (I have a backup drive with all of my information on it) but I have about 500 gigs worth of data so I don't want to take the 8 hours to re-transfer everything if I can help it.

Thanks!!