The MPC USB port is 1.1, so it can only transfer data @ 12 mg per second. And enclosure is basically a shell that you put your HD in (after you take it out of your MP). There is a lil mount for it in the enclosure too. You attach it and slide it into the enclosure. the enclosure is like an external HD except no HD inside cause you put your HD in there, so its kinda like a External HD shell. BUT, it provides USB 2.0 (which transfers data @ 480 mb per second, sooooo much faster than USB 1.1!). So, if you have some GBs to transfer to your HD (GBs are roughly about 1200 MB I think) you can wait about a min per GB with 2.0 or wait a couple hrs for a couple GBs to transfer with 1.1 (which your MP has in the back for your CF and HD to use to transfer).
I understand the specs and speed diff between 1.1 and 2.0 but I am confused on how you are using your ext case.
are you taking out the HD of the MPC , putting it in your external case and then connecting that case to your PC to transfer your samples over? That way it's faster than using the transfer from the PC to the MPC.
If so, then it makes sense. or you might be able to save a step and have a little more versatility with this adapter, it's what I use for imaging drives or pulling data from them quickly.
http://www.newegg.com/Product/Product.a ... 6812156102