User's Manual

omdiag: Using the Diagnostic Service 35
NOTE: This is the longest test in the CD/DVD diagnostics.
NOTE: Multi-session CDs are not supported by this test on supported Red Hat Enterprise Linux operating systems.
If the test fails, insert a different CD without multiple sessions and run the test again.
NOTE: Defective CDs may cause CD drive test failures. If an error occurs, insert a different CD and run the
test again.
omdiag storage floppy
Use the omdiag storage floppy command to test the diskette drive.
The diskette drive test examines your diskette drive using a series of seek and read tests to see if your
drive is working correctly. You must insert a diskette into the diskette drive in order to run this test. The
diskette test performs the following tests:
• Linear seek Test— Tests the integrity of the diskette drive mechanics. Moves the diskette drive heads
continuously, starting from the center of the diskette and moving outward to the maximum track, one
track at a time, until the entire disk is tested.
• Random seek Test — Tests the integrity of the diskette drive mechanics. Moves the diskette drive
heads to several hundred random locations on the diskette, one track at a time.
• Funnel seek Test — Tests the integrity of the diskette drive mechanics. Moves the diskette drive heads
continuously in a funnel fashion. For example, the test moves the heads from the first track on the disk
to the last, then to the second track, and from the second to the last track, and then to the third track,
and so on.
• Extremity Test — Attempts to access sectors beyond the range and confirms the error received.
• Read-Write Test — Targets an appropriate number of sectors. The data on each of these sectors is read
into a buffer where it is stored until it is restored. The algorithm then writes a stream of roving data
onto each sector. It then returns to the first designated sector and reads back the data to confirm the
data integrity. After this, the original data is restored.
NOTICE: On systems running a supported Red Hat Enterprise Linux operating system, disconnecting the USB cable
of a USB diskette drive while the test is running might cause unpredictable results.
NOTE: Defective diskettes may cause the diskette drive test to fail. If an error occurs, insert a different diskette
and run the test again.
NOTE: Read-only diskettes will cause diskette drive test failures. If the test fails, ensure that the read-only switch
on the diskette is in the read-write (or unlocked) position and run the test again.
omdiag storage idedevdiag
Use the omdiag storage idedevdiag to test IDE hard drives to verify that they are functional. The storage
controller test performs the following tests:
IDE Hard Disk Test — Tests the hard drives on your system. This test verifies a drive's ability to respond to
commands, return diagnostic information, and ensure data integrity across the entire hard-drive surface.