I think blacklisting doesn't work for the modules in the initrd (as commented in bug #72765), and libata will get loaded anyway. You can try removing the libata module manually from your initrd.gz, see https://wiki.ubuntu.com/CustomizeLiveInitrd for how to modify an initrd.
-- bad hard disk noise on shutdown https://launchpad.net/bugs/67810 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
