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Is it possible to access an external HDD or USB drive encrypted on Lion, through a Mac running Leopard?

In other words, is FileVault 2 encryption on volumes/partitions backwards compatible? (It really should be.)

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up vote 3 down vote accepted

No - OS X older than Lion cannot read or comprehend/mount/use a Core Storage volume such as used with FileVault 2.

Someone could reverse engineer the protocol and write drivers for older OS or different OS, but I haven't even seen a start towards that effort in any open source project.

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Thanks, that's unfortunate. Would have been nice if Apple had released an update. – Baumr Jan 3 '13 at 17:18

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