The default installation of Pendrive Ubuntu only gives you a 3Gig space, so that it will fit onto a 4Gig UBS flash drive.
If you want to use Pen Drive Ubuntu from your Hard Disk, then you can increase the size of the image file using TopoResize.
To run this program, you have to click on a Batch file called “toporesize”.
After you have done this you have to use fsck to check the disk. fsck can be run from the Ubuntu live CD or from the wubi version. You can’t run fsck from within Portable Ubuntu. Here’s how: