I just received one the Rizone players from ebay, unfortunately before finding this thread. h2testw finds 3.6GB (7696256 sectors). The storage is used in big-floppy mode, no partition table. Reformatting with 'mkdosfs -v -F 32 -n RIZONE /dev/sdb 7696256' (under Linux, double-check /dev/sdb is correct before doing this) turned it into a 3.6GB player. Various AAC or OGG files played fine. Built-in speaker is nice for audiobooks/podcasts. Battery life appears poor when the screen is on, so video does not make too much sense. A 16GB microSDHC card works fine (Sandisk, unknown speed class).
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