SD memory cards are a type of small storage media that are used for a variety of portable devices such as cellphones and cameras. SD cards can also be read on computers that have an SD card reader or card adaptor. There are several types of SD cards, including SD High Capacity or SDHC and MicroSD cards. SDHC and MicroSD cards have a few differences between them.
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Size and Weight
SDHC cards are larger than MicroSD cards: the dimensions of an SDHC card is 24 by 32 millimetres, while a MicroSD card is 11 by 15 millimetres. SDHC cards are also thicker, being 2.1 millimetres thick versus the MicroSD card's 1 millimetre thickness. There is also a weight difference between the two cards, as the SDHC's 2 grams is four times heavier than the MicroSD card's .5 gram weight.
SDHC cards can hold more data, as the maximum storage capacity for an SDHC card is 32 gigabytes, while MicroSD cards have a maximum storage capacity of two gigabytes. However, MicroSDHC cards are also available and have a maximum capacity of 32 gigabytes just like their standard-sized high-capacity counterparts.
SDHC cards are available in Ultra High Speed or UHS formats. Memory cards that are rated at the UHS Speed Class can read and write data much quicker than normal speed class-rated cards, with a maximum transfer speed of 312 megabytes per second. MicroSD cards are not available at the UHS Speed Class rating.
Other Physical Differences
There are two other physical differences between the two cards. SDHC cards have nine pins on the connection interface board, whereas MicroSD cards have one less. SDHC cards also have a "write protect" switch on the left side of the card which allows the user to lock the card so that no additional data can be written to it and currently-stored data cannot be modified. MicroSD cards do not have a "write protect" locking switch.
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