answer:You’re probably having that problem because ubuntu reformatted the specified partition size to a new “extended” filesystem, which can’t be read in windows without special software. If you try to explore the drive under ubuntu and have the same problem, don’t forget that there’s a swap partition which the OS uses in addition to ram…If I remember my old installation correctly, it was a few hundred megs, but that might depend on the amount of ram you had on the machine you installed it with. I remember having a similar problem with a 1gb thumbdrive when I installed damn small linux on it. I think the thing to do here would be to completely reformat the drive back to fat32, and create a smaller partition to install ubuntu on that will be recognized by the installer. This can be done in windows under logical volume management, I think. (when you right-click on my computer, hit manage, then you shoud seec disks or something similar).