User's Manual

34 omdiag: Using the Diagnostic Service
omdiag storage
Use the omdiag storage commands to perform tests on your system’s storage components, such as the
CD drive, DVD drive, diskette drive, hard drive, tape drive, and SCSI or RAID controller.
omdiag storage -?
Use the omdiag storage -? command to see a list of all storage components on the system.
omdiag storage cddvd
Use the omdiag storage cddvd command to test CD and DVD drives.
The CD or DVD drive test runs several tests on a CD or DVD drive to make sure the drive is working
properly. This test determines how many CD or DVD drives are in your system and tests only those
drives that support the appropriate CD or DVD media. To run this test, you must have a data CD or
DVD (such as a program CD or DVD or your system's recovery CD or DVD) in the drive to be tested.
Standard music CDs are not suitable for testing.
NOTE: USB CD and DVD drives present at enumeration should not be disconnected at the time of testing if the USB
CD or DVD drive is being tested. A CD must be present in the CD drive being tested.
If there is no data CD or DVD present in the drive to be tested, you will see the following error message:
Media not present in the drive, or the device may have become
disconnected, or the cable may be bad. Make sure that the cable is
properly connected. Insert media in the drive and run the test again.
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.