A Secure Digital (SD) memory card is a removable storage device used in many portable devices, such as mobile phones and mp3 players. It is actually an upgrade of the earlier MultiMediaCard (MMC). It has the same physical attributes as an MMC, but it s generally thicker and has an extra locking switch on the side that prevents unauthorized reading, writing over, and deleting of data.
A Mini SD memory card measures 20 x 21.5 millimeters. It is commonly used in mobile phones and mp3 players. It usually comes with an SD card adapter. It has a longer operational life.
A Micro SD memory card measures 11 x 15 millimeters. It is commonly used in newer compact devices such as digital cameras. It can be accessed in an SD card slot using an adapter.
Storage capacity: Choose an SD memory card with a storage capacity of at least 128 MB if you will use it on multimedia devices, such as digital cameras and mp3 players.
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