Multiboot USB (OSX only): How to customize partition name?

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http://serverfault.com – Trying to deal with all the Mac OSX recovery disks I've got by moving them to bootable USB images. I've got a big USB drive with multiple partitions for each recovery disk, and it's easy to use Disk Utility to "restore" the recovery DVD to a partition. When I boot my target Mac while holding down the Alt key, I can see all my bootable images and they work great. Problem is, they've all got the same name: "Mac OS X Install DVD." I manage Macs of various vintages. If my target Mac needs 10.6.3 for example, my only option seems to be to try each one until I get past the "Mac OSX can't be (HowTos)