Comment 3 for bug 1765769

The installer uses parted so the problem is there. It also does not appear to be a problem with your WD10EARS. parted -l takes no argument, so your /dev/sda argument is ignored. The -l says to list all drives. It listed /dev/sda just fine, then moves on to another drive where it finds a bogus MAC partition table and complains about it. This often happens on a USB stick that has had the installation .iso dd'd to it, since it contains a hybrid DOS/MAC/ISO disk label and this isn't really valid. Choose ignore rather than cancel and it should print the table instead of bailing out.