The SD Memory Card technology is based on Multimedia memory card. This technology is also known as the MMC. The SD-card has the size of postage stamp. The SD Secure Digital memory card is a form of flash memory card and in nature it is non-volatile.

The SD-card thickness is more than the MMC. The SD card also has additional feature of write protection switch. The SD memory card cannot be used in the slot of MMC card because of their thickness, but the MMC card can be inserted in the slot of SD memory card. The SD memory card is very handy and they can be used in the digital cameras, cellular mobile phones, PDA.

The other forms of SD memory card are the miniSD card and the microSD card. The mini SD-card has the additional security feature of copyright protection. The Mini SD card has large storage capacity and also has the fast speed to access the data.

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