Andrew Greig <[email protected]> wrote:
> [ 6931.390696] FAT-fs (sdb1): Volume was not properly unmounted. Some
> data may be corrupt. Please run fsck.
> [ 6933.198312] FAT-fs (sdb1): error, fat_get_cluster: invalid cluster
> chain (i_pos 0)
> [ 6933.198326] FAT-fs (sdb1): Filesystem has been set read-only

There's your problem, as you noticed.
 
> I do not want to run it in parallel with the root filesystem, I tried to
> nominate /dev/sdb1 and when that didn't work tried /dev/USB0 ...
> nothing.
> 
> Could you recommend the syntax, please?

fsck.vfat -n /dev/sdb1
after making sure that it's on /dev/sdb1 by running fdisk -l or checking the
kernel logs. You don't want to check the wrong drive by mistake.

The -n option performs a check without writing any changes, according to the
manual page. After you've seen the errors, you can decide whether you want to
attempt a repair, or take a backup first with dd, or whatever suits you.

See the fsck.vfat manual page for full details.

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