Here's a shot of the properties panel (from the Microsoft Computer Management thing) for one of my thumb drives:



So basically, this is my 4 GB thumb drive. As expected, it says it has 3824 MB capacity (essentially 4 GB). But underneath that, it says I only have 950 MB of "unallocated space," even though none of it is reserved. And look at this:



Apparently, that's all I've got left. So in essence, I have a 1 GB thumb drive now. I've used it before, though, and it's always worked fine with the full 4 GB, but now I can't get that extra 3 GB no matter what I do. I've already tried formatting it (as FAT, FAT32, and NTFS), I've uninstalled and reinstalled the USB driver, but I still can't get the mem back. The 1 GB I have left works fine, but it's really a waste, so any ideas?

The most probable reason I can see for why it suddenly lost 3 GB is that I used it once to boot and run Ubuntu (10.04) with 3 GB persistency, but I have no idea how that would change it so much...

Some extra info in case you're interested: It's a Kingston DataTraveler G2 with 4 GB storage, and I'm running on Windows Vista. Gonna try it in Linux later (running on another thumb drive).

Opened it up ... and yeah, it got partitioned. There's one drive called "C-ROOT" containing all the files from the previous Ubuntu booting thing, and a 996-MB filesystem. I'll try changing that

EDIT: Yeah, just reformatted it with Disk Utility. What should I put for Scheme? I selected Master Boot Record, but I really have no idea what that is

EDIT2: Oh, well that was ... depressingly easy. Thanks, though.

What are partitions and such? Never heard of that.

Ah ok, I think I get it.

Yeah, that's what I did earlier, but I didn't see any tool to manage partitions, so I had to use Linux.