Thank you for looking into this.

Unfortunately, I cannot remember 100% how I prepared this disk a few
years ago. But most probably, it would have been with cfdisk in Debian
4.

Maybe this WD external disk was originally delivered with a Mac
partition? The disk was at a client's site, where they have many Macs.
So it is also possible someone once connected it to a Mac. But they
certainly didn't "initialize" or "erase" it (to use Macs terminology),
because the disk still has all it's data and works as expected as an
ext3 partition.

So apparently, parted gets mislead in it's partition identification
code, in some special case. Hopefully my sample will help correct this
glitch. I rely a lot on parted since it seems to be the only tool that
allows me to entirely script a partitioning of new disks, and I started
to need to do that a lot.

In the meantime, maybe it is safer to first zero out the first block(s)?
I sometimes do it for the first 512 bytes. Should I do it for all the
first 16K?

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https://bugs.launchpad.net/bugs/909424

Title:
  Parted reports ext3 partition as hfs+

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