mp4sync

Mp4sync is an easy to use tool designed to enable users to keep the content of their MP3 / MP4 player up-to-date with the content of the media collection located on their computer. It also provides options to manage specific limitations of some Chinese MP3/MP4 players.

This It is very simple to use :  · Connect your player using a USB cable to the computer. Mount it, that is open a folder to view files. Take note of the folder name, itl will be useful later. · Start mp4sync. Usually you can do it by double clicking the mp4sync.jar file. if not, use the following command line : "java -jar mp4sync.jar" from the folder where the jar file is located. · In the first text box, mention the root of your music library on your computer. You can also use the browse button to select the place where your music is stored on the computer. · In the second text box, just mention the root folder of the player as noted in step 1. · If you have a limited Chinese player (type of player that don't accept more that 99 files in each folder) uncheck the unlimited player check box · The check button will compare the reference folder and indicate operation the synchronize button will perform

mp4sync is very fast on an existing copy where only some changes are to be applied. It can be slow depending on the player's performance if you are uploading a lot of files. Well not slower than if you copied the files over manually.