I have many MP3 tunes stored on USB drive. I noticed that every time I start the vehicle, the Multi Media system forgets where in FAT table it was reading from 100% of the time when I use a 32GByte USB drive. But if I split up my tunes on to 2 drives, use a 16Gb and 8Gb, it remembers where on the drive it was reading MP3s from. There still is a 50% chance the Multi media system will forget what is was last doing and will start playing the FM radio on the next Key On Drive Cycle.