Operation requires disk

Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

■ You are attempting to load from, or save to, a nondisk
  device such as the printer or keyboard.
 
■ Possible solution:
 
  • Change the device referenced to a valid disk device.
 
■ If you need additional help, move the cursor to a keyword
  and press F1 to open the Help window.