How can I change the title of a boot image?
This is an older post, but I came across it today and figured I'd share what I found.

The 'bless' command seems to make this work. First make sure the disk is mounted, find out which folder it is mounted to, and:

sudo bless --folder &lt;mount_path&gt; -label &lt;desired_label&gt;


For example:

sudo bless --folder "/Volumes/Mac OS X Lion Install ESD" -label "Lion Install"


Whatever you put for the label is what should show up at the choose disk screen when holding option during a boot.

Note that you'll probably want to do this in addition to renaming in Finder or Get Info just to keep them somewhat in sync and make them easier to identify in either case.