I cannot reproduce this bug with a 10.10 USB disk created in usb-creator.
I've started to poke around the other tools people are using in this bug, in the event that these are doing something out of spec. It looks like unetbootin is dropping 0-byte files whenever it encounters a symlink. This may be a red herring, however, as I cannot make apt-cdrom from precise blow up under such conditions. I'll try again tomorrow with 10.10's version.
I cannot reproduce this bug with a 10.10 USB disk created in usb-creator.
I've started to poke around the other tools people are using in this bug, in the event that these are doing something out of spec. It looks like unetbootin is dropping 0-byte files whenever it encounters a symlink. This may be a red herring, however, as I cannot make apt-cdrom from precise blow up under such conditions. I'll try again tomorrow with 10.10's version.