Locate all duplicate files on the specified drive(s).
DUPLICAT [drive1 drive2 ...] [/C] [/N] [/S]
drive1 drive2 ... Specifies the disk drive(s) to search. /C By size, filename and content. This will locate all files that are exactly the same. /N By filename only. This will locate files that have the same name. The files found can differ in size or content. /S By size and filename. This is the default, when no switches are specified. This will locate files the have the same name and size. The files found can differ in content.
When no drives are specified DUPLICAT will search all non-removable hard disks.
The /N switch is the fastest and the /C switch is the slowest.