An SD (Secure Digital) card is a portable storage device popular with cameras, cell phones and GPS (Global Positioning System) receivers. Two variants of it are the microSD and microSDHC.
The microSD is the smallest portable memory card available, in terms of physical dimensions, but it can store up to 4 gigabytes (GBs) of data.
HC stands for "High Capacity." An SDHC card may go up to 64GB but can be as little as 2GBs. This causes some confusion because there are some non-HC SD that come in 2GB and 4GB varieties
This causes a problem when one attempts to use a microSD card in a microSDHC card slot. These two technologies are not compatible. Unless the memory card is labelled "High Capacity" or "HC," it will not work with an HC slot.
However, a microSD card can fit in a miniSD or regular SD slot, if you use an adaptor. While a microSD card is not compatible with a microSDHC slot, it is compatible with miniSD and regular SD.
The next step above HC is XC, which stands for "Extra Capacity." This format is designed to offer up to 2 terabytes of storage space, or 2048 gigabytes. The transfer speeds are expected to increase from 104 megabytes per second (MB/s) to 300 MB/s.
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