Got a Vista laptop with Wubi Ubuntu installed (read: Ubuntu on virtual disks located on the NTFS partition). I only use Ubuntu, but the disk performance is so poor that I want to switch to a normal partition install.
The problem is that the disk was quite full in it's time (~8 GB were free from 130GB), so the USN journal is scattered all over the disk, and since it's unmovable, making the disk partition impossible.
The only thing I can do is to delete it. I looked at a number of sites, Microsoft's Technet counted, but I still don't really understand the risks of the deleting the journal.
What am I risking? Would you recommend doing it?