To do a quick erase, set Format under the Job Window to Only if necessary
and verify to never.
Reformatting a disk that has been previously formatted takes only about 2
seconds per disk. This effectively wipes out the data on a disk by writing
over the disk's FAT (File Allocation Table) and directory table. DiskDupe will
format the first couple of tracks, where the file and directory information
is located, realize that the disk doesn't need to be formatted, and prompt
you for another disk. If you run a DIR or CHKDSK on the disk, you will see
that the disk directory is indeed empty.
If you also want to recheck the disk to make sure there are no damage areas,
set the Verify option to Always. This is quicker than a full reformat, but will
check the entire disk for defects.