Apple

I'm making changes to GUID partition disks partition table, and I would
like the system to re-read the disk in order to recognize new partitions
on the disk.

What do I need to do to get the system to re-read the disk and recognize
the changes?

I've tried several disk util commands (unmountDisk, mountDisk, and
eject) but they don't re-read the disk.

Disk Utility->Eject does the same thing (ie nothing).

I note that this is a FireWire drive, but it could also be an internal
drive or any other non-network drive.

For example, when Disk Utility partitions a disk, it fully unmounts and
then remounts the disk. How can I do the same thing?

Try opening and closing the raw disk node for the whole device.

-- Chris

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References:
	>Rereading A Partition Table (From: "Duane Murphy" <email@hidden>)