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out of date.
SYS0019
SYS0019Explanation
No information can be changed or added to a write-protected diskette.
Action
Make sure that the proper diskette is being used, or remove the write
protection. Retry the command.