The feature you are referring to is officially called “Live File System.” It didn’t change at all in Windows 10, as far as I can tell, and I don’t see any outstanding bugs on that feature, so I doubt that’s the culprit.
First, a sanity check. You are properly ejecting the discs, right? You have to do so to close the session. If you’re pushing the button, that would normally be okay, but also try right clicking on the drive in File Explorer and choosing Eject, to see if that makes a difference.
The first thing that comes to mind is that Windows 10 may no longer see your drive as one that can burn discs, due to some driver issue. There are two ways I know to check this:
- Remove any discs from the drive. Then open up File Explorer and click “This PC” on the left. Check if the drive says it is a DVD-R, DVD-RW, or DVD+RW drive.
- Right click on the start menu, and then open Device Manager. Click to expand the DVD/CD-ROM Drives section. See if it mentions any of those words above.
If either of those show the right words, then this isn’t your problem. But, if not, you may want to go to the website for your computer’s manufacturer and see if there is a DVD driver to install for your particular model of machine. Heck, it probably wouldn’t hurt to check this anyway.
If that’s not it, then I would next suspect the disc. Perhaps something is off and Windows 10 doesn’t detect it as a Live File System disk. The first thing I’d do is just try to repair the disc. You can open up a command prompt as administrator (right click start menu, choose “PowerShell (as admin)” then type cmd
and press enter) then type chkdsk /f d:
(where d: is your DVD drive letter) and press enter and see if it detects and fixes any errors.
If not, or what it fixes doesn’t fix the problem, there’s another more involved check you can do. You can copy all the files off the current disc, and then format a new disc and copy the files to that. Then eject the disc to close the session, and check and see if the files copied properly. Then you can put it back in the Win10 PC and see if you can add more files (testing again in the other PC). Then just use the new disc instead of the old one.
If the original disc is a rewriteable disc, then, if the above works, I’d try formatting the original disc, and copy the files to that, ejecting it, testing it, etc. Doing that might fix whatever problem the disc has, and you’d be able to keep using the old disc. But that might not work, which is why I told you to make a new disc first.
If that doesn’t work, the best I could say is to try checking Microsoft’s tech support forums or possibly the SuperUser Stack Exchange. They might be able to help you figure out the problem. I’d specifically use the word “Live File System,” like "I’m trying to add files to a DVD formatted with Live File System, but the files never actually write. This is new since upgrading to Windows 10.)
That’s all I got for you. I have to admit I’ve not used DVD burners in a long time, and, when I did, I never used the “like a USB drive.” I just used USB drives for that, and only burned DVDs to give to others, or to watch movies.