Your devices are fine so you don't have to worry. The path where NetWorker
places Data Domain devices on the DDR has changed in 7.6.2. So when the
wizard goes to see what devices exist, it's looking at a new path which
didn't exist before and so it doesn't see any. New devices will get created
in this new location and will appear in the wizard. So this is just a side
effect that is only seen in the wizard. The integrity and behavior of your
existing devices is still good.

Hope this helps.

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