A Secure Digital card or as popularly known as carte sd is a memory card having very high capacity and is ultra small in size.Due its tiny size SD card is easily integrated in various portable devices like mobile phones, digital cameras, digital video camcorders,GPS receivers,PDAs,handheld computers etc. It also takes care of the two basic considerations of portable devices which are minimum battery consumption and very high data transfer rate. SD card makes use of flash memory and the data that it stores remains saved even if it loses its external power supply.

When SD card was first developed its dimensions were 24mm X 32mm X 2.1mm and it was jointly marketed by SanDisk, Matsushita and Toshiba in 1999.The electrical contacts of the card are present beneath the surface of the card in order to prevent their contact with user’s fingers. SD cards have their format similar to MultiMedia card and are also similar in size weighing approximately 2 grams.

SD card is particularly useful for the distribution of the copyrighted stuff such as videos, ebooks etc. since it provides security by its encryption abilities. In order to make the SD cards more saleable new features are being added nowadays. SanDisk are making SD cards that have USB connecters. This negates the need of any card reader and enables it to directly plug into USB port. Some SD cards also have Wi-Fi capabilities. There are also various data recovery programs available that can recover deleted data, photos etc. from SD card even from formatted cards.

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