This is Joseph. These cards are used for memory, except that CF cards stores more memory than SD cards. CF cards about the size of a matchbook, where as SD cards are about the size of a postage stamp. The The current capacity for these cards are: CF: 6 GB vs. SD: 1 GB. Also, CF cards are also use for network cards e.g. wireless cards. SD is solely used for memory. Note: to upgrade the mPower you need an SD card with 512 MB or less capacity. I hope this information may help you.
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