Unfortunately, when I installed Windows it wouldn't recognise more than 127.99 gigabytes. So that's the size of my C: partition. All that extra space is unallocated and unusable.
We're talking Windows XP Pro with all three service packs, by the way.
Ideally I'd like to extend C: to include all the space on the drive. I'd also be perfectly content to turn the unallocated space into a separate partition and call it drive D: (which would echo my last setup). As an absolute last-ditch solution, I'm just about willing to reformat everything and reinstall Windows, somehow forcing it to recognise all the space.
I've tried using the Windows Disk Management application. First I tried following the directions to use DISKPART to extend C:, but that failed. Then I tried allocating the space as a separate partition, and that failed too. There were no useful error messages, just "The disk configuration operation did not complete." It refers me to the system log for more information, but I don't know where this is.
On the advice of a friend, I tried Easeus Partition Manager, but it didn't help. Trying to extend C: results very quickly in "An error occurred". Trying to create a new partition in the space makes it work happily for a while but fail at the end with the somewhat more helpful message "Update system information failed".