What does it show in messages after the mount?  That is where I would
expect the underlying read errors to be.

I have also had some issues with certain sdxc readers seeming to not
work well with some cards.  There are also a significant number of MMC
changes going into the kernel recently.  There is an entire new set of
code (not sure if has made it into the latest released kernel yet) for
the UHS-II cards (All UHS-II cards are working backwards compat for
UHS-I).

You might try a different machine/reader and see if it works on a
different one.   The issues I saw only happened with the larger and/or
faster cards and only in some readers.

On Mon, Aug 7, 2023 at 10:19 AM Geoffrey Leach <geoffleach...@gmail.com> wrote:
>
> I have a 1TB SanDisk XC SD card, which has developed a reluctance to
> create files.
>
> UUID=0fd984c4-cf88-408a-8ba5-15b64500bd5c  /Media/SDXC   ext4
> noauto,rw,user 0 0
>
> % sudo mount /Media/SDXC
> % touch /Media/SDXC/foo
> % ls /Media/SDXC/foo
> /Media/SDXC/foo
> % sudo umount /Media/SDXC
> % sudo mount /Media/SDXC
> % ls /Media/SDXC/foo
> /bin/ls: cannot access '/Media/SDXC/foo': No such file or directory
>
> I used root to mount, just to be sure. User mount has the same problem.
> gparted reported a problem with the superblock which was resolved by
> re-formatting and re-creating the partition table. The card has just
> one partition.
>
> Suggestions for further diagnosis would be appreciated.
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