Yes, you can move all a big folder, there is a topic talking about how to move data from the Flash to an external device (hdd, usb etc) to gain space in Flash as well.

The optimization proposed on the topic I gave you also is good, as in fact it removes things not used. So you can gain space on both directions.

http://www.ourdreambox.com/ubbthreads.php?ubb=showflat&Number=2602#Post2602

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