The manual mentions some folder and file count limits for SD cards and a 32G partition but doesn't mention anything about any limits on drives connected via USB.
Has anyone tried something like this?
Any known issues or suggestions for file layouts for quick browsing?
On the Dension I used a structure of first letter->artist->album so you never had to scroll through more than 20-30 items to get anywhere.
Also has anyone tried standard 2.5"HDDs via USB?
I may try testing the limits of VW's tech support by asking them what's the maximum current the USB port can supply

Car is Nov 2012 so should have pretty recent firmware