Comment 14 for bug 508802

Please ignore this if I'm not helping (I'm no expert) but I didn't see any mention here of the requirement that bootable Mac volumes use the GUID partition scheme. Details:

http://support.apple.com/kb/HT1948

A savvy Puredyner might hop into a thread over there and ask better questions than I could.

In case it helps, here's my naive GUI-based GUID instruction:

- Applications > Utilities > Disk Utility.app
- Select the USB device in sidebar (not a volume of a device)
- Go to the Partition tab

An Options button will be available when first partitioning (or re-partitioning) the device. GUID is a choice in there.