TRIGEM CW3S20A Operation Manual page 83

Remove the master MS-DOS diskette from the floppy disk
drive, and put it in its protective envelope. Take out the
backup copy diskette, insert it into the disk drive, and press the
SPACEBAR key.
The computer will read the contents of the backup diskette,
and compare them with the copy of the master diskette that it
has stored in memory. If the information on the two diskettes
is identical, the computer will respond:
Compare another diskette (Y/N)?
Type N to return to the system prompt.
If there is a problem with the backup diskette, or if you put the
wrong diskette into the drive by mistake, the computer will
respond:
Compare error on
side x, track x
If the computer shows compare errors, start the copying
procedure over again at the beginning. The backup copy of the
MS-DOS diskette must be identical to the original. After you
have confirmed that the backup diskette is a good copy of the
master MS-DOS diskette, you may put your master diskette
away in a safe place. From now on, only use the master MS-DOS
diskette to make copies. For all other purposes, use the backup
copy of the MS-DOS diskette. By using the backup copy, you
ensure that any accidental erasures can be replaced.
Using MS-DOS With
Your Computer 4 - 1 5