MFC APP - Copy files from folder to a:\

[Gerry]

Hi guys, I have a dialog based app, that I want to copy files from one location to the a:\ The user clicks a button & the files are copied. The user has no control over the folder files that are copied. I want to be able to check that a disk is in the a:\, & then start copying the files, if the a:\ fills up, don't copy any more files, & if it's in the middle of a copy to rollback & not cancel that file copy. How best can I do this....sample code or direction to site is good.:( Gerry.