Look at this manual: http://help.fdos.org/en/hhstndrd/base/fdisk.htm

Does it really take no arguments?

" (no options) Runs in interactive mode."

However when I run this program, having just booted from my FreeDOS boot floppy disk, I get the error:

"Invalid drive designation...Operation Terminated."

Note that I get this error even though I can do "dir" and interact with the file system on both C: and A:. It also does not matter if I have changed to C: or A: before I type the command. The program also does not seem to accept any arguments on the form: "fdisk c:" or "fdisk c", if I try these commands I get "<c:> should start with '-' or '/'; terminated" and "<c> should be a digit; terminated", respectively.

I can also format C:, with no errors.

What is wrong here? How do I use FreeDOS's version of fdisk?