Nie wiem dokładnie jaka jest różnica, ale przeczytaj sobie to:
Secure Digital media features faster data transfer rates and the ability to manually write-protect data. Secure Digital cards you get for your Palm handheld can also be used with any other Secure Digital media enabled device.
MultiMediaCard technology is used to add content such as games, e-books, travel software, and other data to your handheld inexpensively with no impact on the storage capacity. Cards can be read-only or re-writeable.
To są urywki ze strony
Palm.com.