From what I have read, even though Sandisk created the tf/microsd card, they do not have the best controller on the card. They make one version of the microSD SDHC card that works with most mp3 players, they make one that works with most cameras, they make one that works with most cell phones, and they even make another that works only with the Blackberry. It supposedly is because their cards do not autosense what is needed. One card is set for 1 bit mode, another is set for 4 bit mode, and another is set for SPI mode. Kingston cards however, have all modes enabled and autosense what is needed by the device and are more universally accepted. You can look up the user reviews in Amazon and see what I am talking about.
Unless the user/member rizone32gb is lying, someone has gotten this unit working with a 4GB SDHC card. The forum member (rizone32gb) did not, however, mention the brand of card or the class/speed of the 4GB card that he has working with his Rizone Player.
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