DVDs

https://answers.microsoft.com/en-us/windows/forum/windows_7-files/dvd-disc-drive-shows-my-dvd-r-contains-data-but/4341d25e-5641-4d49-8578-34e7be616dbd

Or

https://answers.microsoft.com/en-us/windows/forum/windows_7-files/dvd-disc-drive-shows-my-dvd-r-contains-data-but/4341d25e-5641-4d49-8578-34e7be616dbd

Or

https://forums.pcmatic.com/topic/153277-wheres-the-data-on-my-dvd-rw-gone-please-help/

Hope this helps…

Did you actually burn the DVD? Windows makes a copy that shows what files will be put on the DVD but they are not actually there until you burn them to the disc.

Its nearly 4am here, so hopefully someone can come on with a clearer explanation if that one made no sense