I would like to add one comment, though. When rebuilding from drive upgrades, I have successfully sync'ed an entire player's worth of data (up to 200GB) in one very long sync session.
The only limitation I have found is based on the number of playlists. There appears to be a fixed amount of playlists that can be uploaded before emplode (or the player, I never bothered to figure out which) crashes. You may want to batch your playlists, especially if you are doing a lot of them at one time. But I have not seen a limit with the number of mp3 files you can send at one time.
Granted, small batches are always better in case something goes wrong. But if you want to do a "set it and forget it" type of upload, you can.
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Paul Grzelak
200GB with 48MB RAM, Illuminated Buttons and Digital Outputs