To get this out of the way up front: Athlon 1Ghz Asus A7V Motherboard with onboard Promise UltraATA-100 controller. A while back I bought 2 200Gig WD ATA-133 Hard Drives. I had one in my older comp and had Gentoo Linux on it, it showed up as full size and all was well. After some time I decided I didn't have the knowledge or time to screw with getting MythTV working on it, espically since KDE was crashing anytime I tried to do much outside of konsole. So I pulled that hd out and layed it to the side (so its physically not in the computer at this point). I then put in the other 200 gig hd and I don't remember what the process was, but I got XP installed on it and had a full 200 gigs (or 187 or whatever it turns out to be). Everything was fine, it was 1 partition NTFS. Now a couple weeks ago, after an Avast update which required a restart, the computer never came back to life. It would stop say some error, not windows related, probably something about invalid system disk or not found and press ctrl alt del to restart. After several reboots and it still not comming up I checked the cables. They were fine, still had problem. So I switched the drive over to the Promise UltraATA-100 controller. This time it displayed the splash screen and got about 2 scrolls of those green dots and hung. This continued, so I tried safe mode, same thing. Hangs at mup.sys. So I tried a repair of Windows, before even getting the option to install, when the setup says "starting windows" down at the bottom (still the text based install part) it hangs. So now I decide that I'm done screwing with that, and I put that Gentoo hd back in, and proceed to install XP SP2 directly to it, I delete all partitions and then notice its not seeing the full size of the hard drive. So I think maybe its just a setup thing, and I create a 100 gig partition and leave the rest unformatted. After windows is done installing, I check disk management, and its got my 100gig partition, and then 27 or 28 gigs of unpartitioned space. Where the hell is the rest of my space? As I say the computer had XP installed on a 200 gig partition earlier, so I don't believe this is that BIOS limitation, hell I think that problem was probably addressed by the time the A7V was released, even if its not I have bios revision 1007 or 08 or 09 on it (don't remember for sure) and it surely was addressed by then. Also as I said this was a clean install of XPSP2 so Windows had addressed the 137 barrier by that point too. So whats wrong? So in summary I really have 2 seperate problems here. 1. Any ideas on why the computer refused to boot the OS when on the regular ide controller, then boots the os on the ata100 but hangs, and hangs on 'loading windows' during the text part of the install before I can do a repair? 2. Where is the rest of my space? BIOS shouldn't be an issue and Windows shouldn't be either (remember I had 200gigs working on this just a month ago).