IBM 3270 Manual page 45

21. Remove your system diskette from drive B.
22. Put a label on the diskette.
Felt Tip Only
Indicate that this is your system diskette and
the date on which you set it up. Also include
the volume label that you made up.
The default control program is now on your
system diskette.
You will use this system diskette to load the
control program into your work station's
memory. When you are ready, go to the section
"Loading the Control Program from a System
Diskette" on page 1-49 in Step 6.
1-36 Book 2 - Setting Up and Learning