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A friend of mine took some pictures with a digital camera, she saved all those pictures on to a CD. She then brought it to Wal-Mart to get pictures printed off. She put the CD in and I couldn't bring up any files. She then brought it home and the same thing happened. She really needs these pictures so I said I would try to get them off of there. I stuck it in my computer and it won't mount. I need some help to get these files off, I have never done this before. Anyone got any ideas?
Yes turn off any automounting services, but I do not know what pinniped mean after that. I recommend run dd_rescue to make an image of the disk. Probably may need to start the end of the disc with dd_rescue to get pass any errors. Then use photorec to scan the image file to try to extract files from the image file. If files are proprietary or files that photorec does not know, it will not retrieve them.
If nothing can be retrieved by photorec, then you have layers of problems. One did your friend may sure the images were on the disc by checking them on a different computer. If your friend did, then complain to Walmart. I think Walmart has a upload feature for printing pictures. That will be the safest for next time. If the disc has a lot of scratches, I suggest buy the following device.
Here's one more rescue program for you: recoverjpeg.
I'd also keep trying it out in different drives, because some are capable of reading bad disks better than others. I had some corrupt homemade video dvds that wouldn't recopy using any of the drives I had, but when I later tried them out on a newer system I'd just finished building, with a new sata dvd drive, they all copied perfectly.
Finally, to avoid similar problems in the future, be sure to not use cheap media or burn your disks at high speed (I had done both in the above case). Always use good quality disks and reduce the writing speed to the slowest possible speed so that the laser has time to cleanly burn the data track.