Invalid gpt on wheezy images
It seems the currently distributed iso images may contain invalid GPT
tables. I downloaded debian-7.3.0-amd64-netinst.iso, wrote it to a USB
stick and tried to add a partition for firmware files as described at
https://www.debian.org/releases/stable/amd64/ch04s03.html.en - but
gdisk reported "Found invalid GPT and valid MBR".
This appears to be due to a bug in xorriso as discussed at
Thomas Schmitt confirmed that: "The problem described there affects
versions 1.2.6 and 1.2.8.
debian-7.3.0-amd64-netinst.iso indeed bears as preparer id
"XORRISO-1.2.6 2013.01.08.103001, LIBISOBURN-1.2.6, LIBISOFS-1.2.6,
You will have to ask at firstname.lastname@example.org whether
the problem is supposed to be fixed in the xorriso binary
that produces the images.
It _should_ be fixed in xorriso-1.3.2 as in Debian testing
and in the current upstream release 1.3.4."