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I put a DVD in the DVD drive. I can open it and see files of .PEF files taken with my Pentax IstD.
I go to Lightroom. Import photos from disk. Select all and Lightroom quickly responds with "can't read files". If I just select one photo it imports it without a problem.
If I copy the DVD to a hard drive, I can then select all of the photos and import them. I can do this but I'm curious as to what the problem might be.