User's Manual

30 omdiag: Using the Diagnostic Service
The CD/DVD drive test performs the following tests:
• Extremity Test — Conducts negative testing on the drive. The drive is requested to execute illegal
commands to access particular extreme sectors or play illegal lists. The test is expected to fail.
• Driver Mechanism Test — Performs the eject, close, and stop actions to determine if the drive servo
mechanism, the door motor, and the spindle motor are operating correctly. Slim CD/DVD drives like
those generally available in portable and rack-optimized systems do not allow retracting of the eject
tray. This kind of CD/DVD drive cannot be tested for drive mechanism test eject and
close functionality.
• Read Exerciser Test — Accesses and reads the actual contents of the media. If the data is in the format
of files, the data is read sector by sector into a temporary memory buffer during the first attempt.
During subsequent reads, the read pattern will follow a random set of sectors for the quick test and a
sequential set of sectors for the complete test. This data is then compared with data that was
previously stored in the memory to ensure the correctness of the read operation.
NOTICE: Allow sufficient time for the operating system to detect the presence of media in the drive before running
the CD/DVD diagnostics.
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.