for DNX-5120 which I am planning to purchase very soon....
Some users have also had issues with the USB device being recognized on startup. If the device is attached when the car is turned on, the device is sometimes not recognized[5][6].

Another issue with USB playback is that the device currently does not allow fast-forward or rewind of the current playing track (this is possible during playback on other media, such as CD or DVD). Full tracks may be advanced or reviewed; however, the seeking is not enabled through the currently playing track

Is above true? has anyone experienced this?
thank you