I have a 320GB hard drive that my 2001 computer only recognises 128GB of. My BIOS doesn't seem to be upgradeable (phoenixBIOS) and a PCI card was suggested to fix the problem. I got a PCI card from a friend and the box clearly says 'Supports hard disk drive larger than 137GB', but it still doesn't work! I reformatted the 320GB and installed the software/whatever for the PCI card, but it still only recognises 128GB. Suggestions?

It's all about the 48-bit LBA support that the original version of XP lack. You need to upgrade the OS to SP1 or SP2. i_XpUser

See the oem documentation on that drive. It offers solutions for almost all newer computers. Some solutions are software DDO and yes, you might need to get an addon pci card to support the lastes modes but your bios must support some of it all. See about an update to bios that talks about large hard drives. Go online for the latest that the drive maker offers to correct that. As above you do need one of a few os's and patchs/updates to support them.

Go here for the complete story. http://homepage.ntlworld.com/mosaddique/Working%20with%20Large%20Hard%20Drives.html http://computervitals.com/

Did you use FAT32 or NTFS when you formatted the drive? Are you using an 80 wire IDE cable?

80 wire IDE cable? I don't know what that is! My hard drive is NTFS, though. I'm going to try and install SP1 and maybe SP2 on it. Blaaaah, those take so long to do.