Quote:
Originally Posted by DaleDe
1GB and smaller cards are compatible with the older MMC format. At two Gig the block size was changed. This is why, as the bootstrap ROM is not very sophisticated and expects a single block size and FAT file system.
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SDHC card also use a FAT system (FAT or FAT32).
The standard was first changed to allow up to 4G MMC cards (4 bits was used for specifying the block size and the mazimum size is 2048 compared to 512 for the oldest standard).