hibernat.sys should only be just a tad bigger than total memory installed (1GB mem = about 1.1GB hard drive space used).
Yes, it's huge, but it's also generally placed at the 'front' of the drive, behind the paging file, for quick access.
So, yes, if you're short on drive space, and don't have a lot of memory (and/or slow drives, etc), it'll begin to look pretty ugly pretty quick.
Bookmarks