IBM 3270 Maintenance Manual page 290

Fixed Disk Drive Adapter test will run. If the
test ends without an error, the following will
appear.
TESTING - X FIXED DISK DRIVE(S) & ADAPTER
o -
RUN FIXED DISK TEST
1 - RUN MEASUREMENTS TEST
2 - FORMAT FIXED DISK
9 - EXIT FIXED DISK TESTS
ENTER THE ACTION DESIRED?
DID THE TEST FINISH WITHOUT AN
ERROR?
NO
Go to page 3-1700-21.
YES
October 1984
3-170~3