I'm suggesting this in order to have a more informed pc
user out there. Please change your terminology.
When a disk is formatted, there is no such word as unformat
it can be said as undo, or can a format be undone.
once a disk is formatted most, if not all data are gone.
if a file on a disc is deleted, floppy or hard disc
sometimes, it can be retrieved with utilities, depending
on a few things, usage of the hd after deletion,
importance of the data (how much money you are willing to
spend to get it back) etc I hope this helps.
You can do a search on google for software programs to
undelete. Good luck!