well..if the external is USB2 then it will lag things down for various reasons...

if its firewire things should move rather nicely...

I rarely use my 2 USB2 externals...and I've found it damned near impossible to transfer files across those 2 drives...I get occasional delayed write transaction errors when going to either of the externals from an internal, but after I learned I had to go offline and disable my AV (it was scanning the files as they were being transferred) I very rarely have issues any more...

in summation, USB2 drives rather suck..

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So Long and Thanks for All the Files
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