Atari DOS 2.5: XF551 Owner's Manual page 26

Label your new copy of DOS 2.5 clearly - something like "DOS
2.5 - System Disk" . Attach a write-protect tab to it (see "Using
Write-Protect Tabs," below) and use it as your working copy of
DOS from now on . Store your original DOS 2.5 Master Diskette
in a safe place .
(Another way to make a DOS Syslem Diskette is to use option H.,
WRITE DOS FILES , to write DOS.SYS and DOS .DUP on a for-
matted diskette. With some applications, such as AtariWriter,
it
is recommended that you write DOS files on
every
data diskette
you plan to use to store files. This way, you can load DOS directly
from your data diskettes as you load the application program .
See your AtariWriter User's Guide and Section 3 of this manual.)
The DUPLICATE DISK function is sometimes confused with the
COPY FILES function of DOS. The COPY FILES function copies
only the files you specify from a source diskette . The DUPLI-
CATE DISK function is more efficient when you want to make
complete backup copies of data diskettes containing several
files.
Using Write-Protect Tabs
Before duplicating a diskette or copying files from one diskette to
another, it is a good idea to attach a write-protect tab to your
source diskette. (Included with every package of diskettes that
you buy, these tabs are adhesive but can easily be removed.)
When folded over the notch in the edge of a diskette, a write-
protect tab prevents your disk drive from writing information over
any files that may already be there.
Particularly when you are using one disk drive to duplicate or
copy files, you might mistakenly insert the source diskette when
your disk drive is ready to write information onto the destination
diskette. A write-protect tab on the source diskette prevents the
drive from writing over (and destroying) your original data.
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