I assume that the partition table and swap partition on the new disc are still OK, so doing that mke2fs should safe your from needing to do the disc builder. As for the copying (including empty directories where needed), you could use cd /drive0; tar -cf - . | (cd /drive1; tar -xpvf -) this assumes that the old discs music partition is mounted under /drive0 and the new discs music partition is mounted under /drive1 like the original empeg init mounts them.
cu,
sven
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proud owner of MkII 40GB & MkIIa 60GB both lit by God and HiJacked by Lord