In order to use this, you must be in RTime mode. You will be asked for overwrite confirmation of any file that already exists. This is because floppy drives are just too slow for the fast recording for which the DDisk option is designed.
Recording begins immediately after the file name is accepted.
Alternatively, if the Memory Write mode is selected, the recording will start immediately upon hitting the D-key. You won't be prompted for a file name until the recording ends, and then you have the option of saving to any drive, including a floppy, or aborting via the ESC key and confirm prompt. You may end the recording at any time by turning off DDisk with the same D-key. While the recording is in progress, certain key options and menu items will be disabled to avoid interference with the recording process. No Help system access is available during recording, to prevent contention for the disk drive.