/Volumes/HD2/3rd\ Party\ Stuff/Apps/Pacifist/hfs_comp_tool /system/library/*
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  Google comes up
totally dry.Care to share the wealth?
1. I didn't know that about block-level copies (not to say that I've even fully digested the difference between file and block-level copies yet).
Easy enough. File-level copies individual files one-by-one... so they will not end up in the same "physical" locations on the target disk. Logically identical pathnames, yes... but not in terms of "byte addresses" on disk. That's why/how a (normal) restore can "defragment" a disk.
Block-copy literally duplicates data by disk sectors (has no notion of "files" at all). Some call this the only true clone. [if the source disk has directory damage however, it will be faithfully reproduced on the target.]
2.Yes, I booted into my Leopard volume to restore the SL volume.
Apparently 10.5 and 10.6 will treat the new xattrs differently. (10.5 is unaware that they are "special" xattrs).
Does that hold true even if the destination volume has been erased beforehand?
Definitely. Disk Utility doesn't care if the disk is already erased or not. It *only* does a block-level copy when we tell it to do the erasing.
