I recently purchased a 4GB CompactFlash card for my Zaurus SL-C760. When I try to use the Voice Recorder program that comes with the stock Sharp ROM, the Voice Recorder program informs me that there is not enough storage space. I am guessing that the Voice Recorder is using a 32 bit signed long integer with an upper limit of 2GB for positive integer representations, causing a larger positive number, such as 4GB, to overflow into negative number representations. That is annoying. TkcVox does not complain about the 4GB card, so I am using tkcVox now to record voice audio.