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Originally Posted by JeffElkins
Actually, that 2GB "expansion" is an irritant. Standard SD is 8 MB to 4 GB, so I'm not sure why they limit it to 2.
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Because there is no standard way that SD card manufacturers implement non-SDHC capacities above 2GB. A variety of different addressing schemes are used, which are mutually incompatible. 2GB is where the "standard" stops.
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Worse yet, modern devices have moved to SDHC, which is 4 GB to 128 GB.
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True, but relatively few devices appear to support SDHC cards as yet. I have numerous devices with SD cards - HP iPaq PDA, Pentax camera, Garmin SatNav, Gen3; I don't think any of them support SDHC.
Someone reported here that the controller that the Gen3 uses does actually support SDHC, so it's certainly possible that support for larger cards could be added in a future firmware upgrade. Personally, however, I find 2GB to be quite sufficient.