
Fastest way to copy files
dd isn't a very good way to do this because:-
(i) it copies empty space as well as the files so takes longer
(ii) it copies over bad blocks etc..
-- rsync would be a good way to do this as any subsequent changes
would be diffs only and it can be done securely over network if
necessary - also it can compress data on fly.
an additional advantage would be only having to learn one lot of
syntax.