can't find nero recode files to delete

[mc477]

i have been burning files from limewire to dvd. when i complete the job, l cant find the files to delete. i have two hard drives, labeled c and d. my c drive seems fine but d drive has suddenly lost 80 percent of its capacity since i started burning these dvd files. i have set d drive as the hard disk to use for the recoding but cant remove the file after burning is complete. please help gpadog@yahoo.com thanks .