Almost all tapes and diskettes, and in a few rare cases, even disks can
be write protected, to protect data on them from being changed.
Once an archive is written, you should write protect the media to prevent
the archive from being accidently overwritten or deleted. (This will
protect the archive from being changed with a tape or floppy drive--it
will not protect it from magnet fields or other physical hazards).
The write protection device itself is usually an integral part of the
physical media, and can be a two position (write enabled/write
disabled) switch, a notch which can be popped out or covered, a ring
which can be removed from the center of a tape reel, or some other
changeable feature.
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