drive unreadable after moving to new comp

Hey guys,
First post. I was googling for help with the issue I'm currently having and one of the archived threads from this place came up, so I figured I'd give this forum a try.

I recently bought a new computer (basically parts, no vid card), and when I put in my video card and hard drives from the old computer and turned the new one on for the first time, it gave me some problems. First I had to mess around a bit with the boot sequence because one of my old HDDs is primary master even though the new SATA drive is the one with the OS on it. After fiddling with the BIOS for a while, it booted from the SATA drive but gave an "NTLDR" related error. I put in my winxp disk and booted from it and tried to repair the problem (did a couple FIX---- commands) but then just ended up reinstalling (since there was nothing on the drive anyway). After the reinstall, everything works fine EXCEPT my WD 200 gig is "unreadable". It recognizes that it's there, but doesn't assign it a drive letter or anything, and then when I go to the drive management to see if the partition is still there, it says that the disk is "dynamic" (the other 2 are basic) and unreadable. Converting to basic isn't an option because I would lose almost 200 gigs of data. Is it possible to accidentally convert a drive to dynamic (maybe when I booted from the xp disk and ran a couple commands)? Is it possible that it was always dynamic and I just never knew/looked? If so, why would it be working fine on my old computer (running win2k), but after the move it's unreadable? Is there a chance that this is just caused by it being a large drive and I need to get SP2?

I'm going to install SP2 when I get home, but in the meantime any help or insight would be greatly appreciated.