[errcorrectcode]

Muhaha.

As a DoS of DOS: x:\> copy c:\config.sys CLOCK$

Also special DOS filenames:

    CON PRN AUX NUL {COM,LPT}[1-9]

https://superuser.com/questions/1362080/which-characters-are...

Print autoexec.bat to the dot matrix printer on LPT1?

    x:\> copy autoexec.bat lpt1
    x:\>

Create a file called foo.txt without an editor?

    x:\> copy con foo.txt
    whatever
    whatever
    whatever
    whatever
    ^Z<ENTER>
    x:\>

A social DoS of any machine with BASIC or similar.

    10 INPUT "Press any key to continue..."; $X
    20 GOTO 10

When good floppies go bad:

    General Failure reading drive A:\.
    Abort, Ignore, Retry, Fail?