It looks like this disk originally had a FAT filesystem on it, and was
then overwritten with a normal partition table; however, a fresh boot
sector was never written, and so the remnants of the old FAT filesystem
are still hanging around. This makes a safety check in libparted kick
in, because it thinks that the whole disk is a single FAT filesystem and
so it shouldn't do anything with it.

The Linux kernel uses a different check for this, namely checking the
active flag for each entry in the partition table and bailing out if
it's neither 0 nor 0x80. I'll check this with upstream.

-- 
parted gets partitions wrong
https://bugs.launchpad.net/bugs/232175
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