Hello All... Now that I'm actually doing some FCP editing with my iBook, (as opposed to doing it all with nice (though quickly becoming outdated) system at work), I figure it's time to invest in a proper scratch disk. I don't need crazy amounts of storage, I'm looking in the 160-250GB range. My upper limit (budget-wise) is $250. I've been looking at either buying a pure external (preferably with both FireWire AND USB 2.0) or buying an internal and one of those kits that allows you to use an internal drive as external. It seems to me that the kit option might be cheaper in the long run, since internals are cheaper, and I would be able to buy another internal drive at a later date--were this one to become crappy/obsolete. Here's my major question. When I look at the specs on these drives, the typical data transfer rate for the internals seems to fall in the range of 100-150 MBps, whereas the rates for the externals typically fall into the 400 MBps range. I was wondering if this is true? If using an external drive does actually give you faster transfer rates. If so, why? Are the drives built differently? Thanks!