Jens Arnold wrote:

>> They're not as popular as SD, therefore lag behind. SD(HC) has
>
> Standard SD has a limit of 2GB. SDHC is specified for up to 32GB.
> The technical limit is much higher: SDHC uses block addressing
> instead of byte addressing. Therefore it's also not backwards
> compatible: an old SD card reader cannot read SDHC cards.

> For MMC, things are similar. MMC3.x (and older) and
> MMC4.0/MMC4.1 use byte addressing, and are therefore limited to
> 4GB. MMC4.2 introduces block addressing, pushing the theoretical
> limit to 2TB (iiuc).

Also note that for 2 GB MMC/SD cards, some could still use byte addressing, others can already be "block" based.

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Received on 2008-08-25