Drive Paths in XP Device Manager

When I change a drive to be accessed by a different letter, let’s say from D:\ to T:\, even after a restart, D:\ is still not available. I have two drives, 250g boot drive with 2 equally sized partitions, and a 120g storage drive with another 2 equally sized partitions. My Device Manager now shows this:

Disk 0: [C:][I:]
Disk 1: [T:][U:]

And drives F, G, H, J, K, L, M, N, O, P, and Q are all taken up by various types of removable storage and virtual drives.

I want I:\ on Disk0 to be D:\, but when I access the change letter path dialog, I: is the lowest drive letter listed.

Yes, I have restarted my computer, nothing else should be taking up that path.