IBM AT/370 Manual To Operations page 45

Partitioning Your Fixed Disk
1
Set the system unit Power switch to Off.
2
Get the DOS diskette from the back of IBM
DOS (Disk Operating System).
3
Insert the DOS diskette into drive
A.
Push the
diskette in until you hear it click into place.
I
i
DOS Diskette
Diskette Drive A
7
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AT/370 System Setup 3-9