On 10/04/2008, at 5:05 AM, Herb Petschauer wrote:
And note that only a GUID partition table scheme will yield partitions with a UUID. The old style Apple Partition Map will not (so any legacy or even current PPC machines).
No this is incorrect. Volumes have a UUID of their own and is different from the one used in the GUID partition map. Disk Utility displays the volume UUID. In HFS the UUID is not actually a proper UUID but is generated from 8 bytes in the Finder Info of the volume header. Have a look at the Darwin source code if you want to know how it's computed. I'm not sure how they're computed for other file-system types.
The UUID displayed in the IO registry is the GUID partition map UUID.The UUID that you want to use depends upon the application. If you want something that always refers to the same volume, you should use the volume UUID. Unfortunately, there were bugs in older versions of OS X that meant it's possible for two volumes to end up with the same UUID so be prepared for this. You might also get duplicates for volumes that have been cloned. If you want something that refers to the same physical partition, you should use the partition UUID but that obviously only works for GUID partition maps so you're actually better off using something else if that's what you want to do.
I hope this isn't for a competitor to one of our products. :-) - Chris
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