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 .

Clone Download Killer is an internet tool help you check identify of this URL before really download it. CDK would check the duplicate of file name , file size and content snippet. CDK check files with very high speed , in general , within 5 seconds you could see whether you had download the file before . CDK also monitor the click in Internet Explorer , as you click a file type like ".exe;.Zip;.Rar..." , I would automatically check it .