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Maybe you can use a MMC(Multi Media Card) and AT89C51SND1 uController which has MMC built in implementation.So you can change you card too and change the capacity of your flash disk.If this is anew topic for you,maybe you have to read some documentations about FAT16 (or FAT32 if capacity will goes beyound the 512MB),because you have to have a FAT implementation layer in your firmware.AT89C51SND1 has 64KB flash memory and you have enough space for your firmware,specially you can use its speciall registers for MMC and don't have to simulates the wave forms for communicating with memory card.
MMC is a simple SPI interace. As all FLASH memeory, at needs a spacial sequance to read/write/erase.
On google search for "MP3 circuits microchip" You will find alot of links and code for using the MMC and also code for the FAT16.
Also, there are other SPI Flash memeory on the market today that they are very large. Can find the part number. Try on the web. If you cant, post and i will give my computer a good search.
Good luck.
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