I have come to the conclusion that the factory head units are seriously lame with regard to USB playback. You are better off to get some external player and run it through the AUX input.
1) They will only recognize about 6 or 7 thousand songs.
2) No play lists.
3) Playback sequence is the order that songs are listed in the FAT file system tables. This is NOT the same as sorted order. You have to get a special utility (alluded to in a previous comment) which will sort the FAT directory tables.
4) No playback of anything but WAV and MP3. No FLAC or OGG or M4A, for example.
5) I suspect the maximum file system size is 64gb.
6) Navigation controls are near impossible to use while driving.
My 12 year old, $50 Sansa Clip+ is a FAR better player.
1) They will only recognize about 6 or 7 thousand songs.
2) No play lists.
3) Playback sequence is the order that songs are listed in the FAT file system tables. This is NOT the same as sorted order. You have to get a special utility (alluded to in a previous comment) which will sort the FAT directory tables.
4) No playback of anything but WAV and MP3. No FLAC or OGG or M4A, for example.
5) I suspect the maximum file system size is 64gb.
6) Navigation controls are near impossible to use while driving.
My 12 year old, $50 Sansa Clip+ is a FAR better player.