Using the guide on ubuntu.com I installed the image of the netbook edition on my external HDD using Pendrive on Windows. I was not aware that it would create such a mess and now want to get rid of it again, still retaining my old files. How can I do that?
If I'm not mistaken, the USB installer adds some files in the root folder of the USB disk and makes it bootable by adding some code in the Master Boot Record.
You can safely remove the files created by the USB installer using the Delete button.
You can restore (read: clear) the MBR (Master Boot Record) using the following command:
Here, you can see that
For relabeling the partition, you can use GParted, see How can I relabel my flash drive?.