Diskcopy

In computing, diskcopy is a command used on a number of operating systems for copying the complete contents of a diskette to another diskette.
Implementations.
The command is available in MS-DOS, IBM PC DOS, DR FlexOS, IBM/Toshiba 4690 OS, MetaComCo TRIPOS, Processor Technology PTDOS, AmigaDOS, TSL PC-MOS, PTS-DOS, SISNE plus, FreeDOS, IBM OS/2, and Microsoft Windows.
The MS-DOS version was originally written in August 1982.
It is available in MS-DOS versions 2 and later. Digital Research DR DOS 6.0 and Datalight ROM-DOS also include an implementation of the command. The FreeDOS version was developed by Imre Leber and is licensed under the GNU GPL 2.
The command is not included in Windows 10.
Example.
diskcopy a: b:
diskcopy a:
diskcopy a: /1
diskcopy a: /V
diskcopy a: /M
Limitation.
Diskcopy does not work with hard disk drives, CDs, network drives, Zip drives, or USB drives, etc. It also does not allow diskcopy from 3.5 inch drive to 5.25 inch drives, and vice versa. The source and target drive must be the same size.