qp.hlp (Topic list)
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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.
Drive not ready
  An attempt was made to open, save, or write to a drive
  that is not ready to access its disk.
 
  This usually happens because the drive door is still
  open. Check the drive door and try again.