IBM 3270 Maintenance Manual page 305

To Format a Fixed Disk Drive
Warning: Formatting will destroy all data on
the fixed disk drive. After formatting your fixed
disk drive, the drive will have to be made ready
to accept data. Refer to your disk operating
system manual for the needed commands. The
backup data may then be loaded onto the fixed
disk drive.
You have entered this page because you have
identified a failing fixed disk drive. Before
replacing the drive, first try to format it, then do
the diagnostic tests. Because formatting destroys
all data on the drive, do it as the last step before
replacing the drive. After you format the drive,
you may reload the data from your backup
diskette.
1. Set the Power switch on the system unit (and
expansion unit, if attached) to Off.
2. Install the fixed disk drives and connect any
data and control connectors that were
disconnected during testing.
3. Insert your Diagnostics diskette in drive A.
4.
Set the Power switch on the expansion unit
(if attached) and system unit to On.
5. After the diskette loads, press 0 (RUN
DIAGNOSTIC ROUTINES) then Enter.
6. Depending on the configuration of your
system, questions about attached devices may
appear on your screen. Press Y or N as
required, then press Enter.
CONTINUE
3-1700-18 Maintenance Information