partially invisible back-up DVD.

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(fedora-34; gnome)

The evening before doing a Fedora upgrade, I do a user data back-up.  I do it as a data project in K3b to burn a DVD/Blu-ray (BD-R).  I always "test" the back-up immediately after it's done.

On April 07, 2021, I did such a back-up.  I upgraded from f-32 to f-33 the next day.  Today, when I put the disc into the drive, it automatically mounts and asks if I wish to view contents in Caja.  In Caja, I successfully viewed an image stored on the disc, launched in Firefox an html file stored on the disc, and opened in LibreOffice a LibreOffice file stored on the disc.  The disc was successfully unmounted and ejected when I asked Caja to do so.  Also today, if I launch Files and then put the disc into the drive, it automatically mounts the disc. In Files, I successfully viewed an image stored on the disc, launched in Firefox an html file stored on the disc, and opened in LibreOffice a LibreOffice file stored on the disc.  The disc was successfully unmounted and ejected when I asked Files to do so.

On October 13, I did a user data back-up.  Immediately after, I "tested" the back-up.  1. When I put the disc into the drive, nothing showed up on the screen.  But I then launched Disks, the disc was there and mounted; it unmounted and ejected the disc when I told it to.  2. When I launched Files and then put the disc into the drive, the "+ Other Locations" flickered once, and that's all.  But when I then launched Disks, the disc was there and mounted; it unmounted and ejected the disc when I told it to.  3. When I launched Caja and then put the disc into the drive, a message popped up
"Unable to mount .F33_20211013
An operation is already pending".
But when I then launched Disks, the disc was there and mounted; it unmounted and ejected the disc when I told it to.  4. When I launched Disks and then put the disc into the drive, the icon for the drive showed a disc.  When I clicked that disc icon, it showed it mounted.  When I clicked the mount path that showed below the graphic part of Disks, it launched Caja.  I then successfully completed the "test" just as I did with the April 07 back-up disc, except that I had to use Disks to unmount and eject the disk.  Also, I was able to restore a files from the back-up disc when using the Caja instance launched by Disks.
I went ahead and upgraded from f-33 to f-34 the next day.

Today, when I repeat steps 1-4 above using the October 13 back-up, I get the same results.

Both back-up discs are Verbatum MDISC BD-R Blu-ray Disc, 25GB, 4x speed.  Both were written with the same drive.

What went wrong, and how do I fix it?

Thank-you in advance.
Bill.
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