I'm by no means an expert when it comes to this stuff... but by skimming through the link that Tormod posted, it appears that there's in a bug in the kernel(s) that have to do with our hardware being recognized as SCSI? (i.e /dev/sd*), which makes sense because my partitions are recognized as sda1 - sda4, whereas on my other machine that doesn't have the shutdown noise, the partitions are recognized as hda instead of sda.
-- 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