xD Picture memory (for eXtreme Digital) is a type of memory card created by Fuji and Olympus in August 2002.
The architecture of xD cards is based on NAND type flash memory circuits (EEPROM)
xD picture card memory is smaller in size than a postal stamp (20.0mm x 25.0mm x 1.7mm) and weighs barely 2 grams.
Access to the data is carried out via a lateral connector with 18 pins, allowing a transfer rate of 1.3 Mb/s to be reached and potentially up to 3Mb/s for writing and around 5 Mb/s for reading.
In time it is expected that xD picture cards will reach a capacity of 8Gb. 
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