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SDHC are higher capacity cards. They are used by a lot of devices these days. The Micro-SD cards are SDHC with a smaller form factor. Usually they come with an adapter so you can use a standard size reader.
SDXC are above 32GB cards and are not used by many devices (yet). My HP Slate 500 is SDXC which means with a 64GB card, I doubled the storage capacity.
High speed cards read and write faster. Look at the GB/s. Some of the older devices will not be able to transfer as fast as the card can take.
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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