1) Easy (and most likely cheaper) to get a “regular disk” version and swap it yourself. That way you can get a 512 in there. And if 512 doesn’t hold your entire collection, you are in trouble. Not because of the lack of space, but because of the amount of music LOL. I am currently rebuilding my core collection. Limit is between 1.200 and 1.500 tracks. Anything over that goes on my removable hard disk that holds my other 40k+ request tracks. I don’t let them into iTunes or my DJ software anymore. Works like a charm.
2) The way OSX treats files (including music) is different from the way windows does. It can be done the way you suggest, but I’d suggest doing the work on your MBP and keeping it there (get a time machine while you are at it for that ever important backup). Alternatively (my current workflow) is that I download tracks on my PC, fixed it up so the filename is to my liking and such, make a copy of the original in my “Originals Vault” on my NAS (network disk). Then I do my prep work, Platinum Notes, Mixed in Key, a tag editor (I use Tag&Rename but there are plenty of other good ones) and I fix the cover art if possible. Then I move the files to a shared folder on my NAS. I access the NAS folder from my MBP and import the new tracks into iTunes (set to make a local copy in the iTunes folder). Once imported, I delete the contents of the shared folder.
This leaves me with correctly prepped tracks in iTunes and ready for import in DJ software (and further prepping: waveforms, cues, loops, etc.) and the original (high quality MP3 or lossless) track.
Hope that helps some
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