IBM 5150 Manual To Operations page 106

7
You will see this message:
Formatting...
and after a little whirring and clicking in drive B:, the
rest of the message appears:
Formatting ... Format complete
Format another? (YIN)?
-~
.......
The cursor
8
Type this:
n
You do not have to press the En ter key.
9
Now the DOS prompt appears:
It>
The new diskette is now formatted; that is, it is ready to
have a copy of the DOS Diskette information written on
it.
10
Type this:
diskcopy a: b:
and press the Enter key.
DOS 3-32