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What about copying a volume that's used by a "later" OS version that might (but not necessarily) have also been created on it?
Actually, I'm not entirely sure what you meant by "created" in your reply.
I have an external drive containing three volumes, all created under Leopard. Two are small bootable volumes, one each for PPC and Intel systems. The other is used for Time Machine backups, used only on my single Intel system. After upgrading the Intel system to SL I'd also like to upgrade the Intel-bootable volume on the external drive and use the TM volume under SL. The PPC-bootable volume (with 10.5.8) will remain relatively static, maybe doing an occasional Apple security update while booted from it. All three volumes mount when the drive is attached to any system and I manually unmount those not being used.
Post-upgrade, presumably it'll be best never to copy the two SL volumes with the drive attached to a Leopard system but okay to do what I like with the Leopard volume. And when running SL I'd expect the external SL volumes to be generally usable, but what about the Leopard volume? Would it be best to unmount and ignore it, or could it be safely copied with SD! if necessary?
Going back to my original question, assume that the volume currently being used for TM backups is instead intended for data to be sharable with any combination of Leopard/SL OS and PPC/Intel system I'm running. Let's say I erase and start using it under Leopard. Are there any conditions for later usage/copying on a SL system? And can I use/copy it under Leopard later?
If I recreated that "data" volume under SL could it be safely copied with Leopard? Or could that depend on the type of usage it gets while running under SL?
Sorry for the verbosity; hope it makes (some) sense. Before upgrading to SL I'm interested in having a better understanding of any volume interoperability issues with usage/copying under both Leopard and SL.
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