A SD (Secure Digital) card is an improved version of the MMC with a physical profile of 24mm x 32mm x 2.1mm which is approximately the size of a postage stamp. It simple words, it is just another type of flash memory which made compact and creative designs possible. In fact the SD technology, borne the SD Association which is a collaboration of more than 1000 companies which Design, Develop and Manufacture products using SD technology. The SD technology is the world market leader in this segment and typically the standards in this technology are set by the Association.

Usually SD cards are available with card capacities ranging from 1GB to 4GB. Most commonly SD Card 2GB is used in digital cameras or mobile phones, which sometimes comes with an adapter to help it fit into the SD card slot. The memory card should be well chosen to match with the device and it is advisable to consult the dealer for specific information.

The SD Card 2GB has enormous data storage capacity. It allows one to store MP3 music of about 34 hours or about 750 photos with a resolution of 10 Megapixels. It also has flexible speeds ranging from 6x to 300x where 1x is the speed of data transfer of 150kB/s. The maximum read and maximum write speeds vary for most cards which a user needs to be aware of before selecting the card. Also an optional write protection tab may be availed in case one does not want modifications in the stored data.

The SD Card 2GB is available in the market at a price of about 7USD and may be prices higher depending on the data transfer speeds and other features. With every passing year, the memory card has been improvised and shortly wireless SD cards may become affordable enabling more convenient data transfer at higher speeds.