Duplicate files manager help you find out and clean duplicate files,expand disk space and optimize disk. You could find files with same content , same file name or same size . And compare two folders,find out same files between two groups.It use some compare arithmethic to scan duplciate files, it could scan faster , or scan using less memory. After scan finish , I could generate a report of your files, report how much free space you could get.It could save scan result as job so that process it later.