I use the USB disk option (not Aux-In) and the I-drive Media Player for all my music and it really works like a dream.

One thing I noted is the order in which tracks from Albums are displayed.
They are displayed in alhabetical order, not in their original order as they were on the CD.
This is when you choose to select by Album for example.
If you go in by "Directory" you will also get it alphabetical, but as my Rip program has put "01, 02, 03" in front of the filenames, it will then be sorted in the right order. But I don't want to use Directory, I like using Album, Genre or Artist as the entry point for song selection.

I don't know how the I-drive Media Player would know what the original track order on the CD was, but I can't think of an MP3 player which has this wrong. Maybe MP3 players use the ripped file name (with the 01,02 prefix) to determine that?

Has anyone else experienced this? Has anyone been able to change this?
Or should we report this to BMW to have this fixed in V28?