First of all, retrofitting anything in a VW is not recommended as even the so called "experts" almost never get it right 100%.
Everything these days is controlled by the computer. You even have to tell it to supply power to individual cables before you get anything. There are a million and one settings and I can make a safe bet that unless you work for VW and were trained in VW electronics, you haven't got a hope in hell to get it right. A perfect example is the power drain issue in another thread here.
To answer some of your questions, the hard drive is partitioned into two. One 10Gb for the maps and one 20Gb for your mp3. Not wma. Mathematically however, your 20Gb partition will end up looking like an 18.62Gb. Nothing you can do about it.
All steering wheel controls need to be coded. Like I said, unless you know 100% what you are doing, good luck.
Firmware version can be read off the "hidden menu" screen. Hold the "setup" button until the 3rd menu appears. About 15 sec. Yours may not be active. In that case you need to use VCDS.
A map DVD from VW retails for about $1200.
Good Luck
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