Brother CM-2000 - Manual (Page 169)

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spelling Checker
Notes!
You can only have one user dictionary on a disk if you need several user dictionaries
for different purposes, they must be on different disks.
Saving a user dictionary onto a disk ovenz/rites any user dictionary on that disk. If you
want to add words to an existing user dictionary on disk rather than replacing it with
a new one, makes sure it has been loaded before starting the spelling check. After
completing the spelling check and adding new words to the user dictionary, save the
new version on disk.