SD Card (Secure Digital)

December 2016

Secure Digital


Secure Digital memory (known as SD or SD Card) is a type of memory card created by Matsushita Electronic, SanDisk and Toshiba in January 2000. Secure Digital memory is a memory specifically developed to meet new safety requirements in the field of electronic audio and video devices. It therefore includes a copyright protection system that satisfies the SDMI (Secure Digital Music Initiative) standard.

The architecture of the SD cards is based on NAND-type flash memory circuits (EEPROM).

The Secure Digital memory has small dimensions (24.0mm x 32.0mm x 2.1mm), equivalent to those of a postage stamp, and weighs barely 2 grammes.

SD Card - Secure Digital


Data are accessed using a 9-pin lateral connector achieving a transfer speed of 2 Mb/s with the potential to go up to 10 MB/s.

SD memory access time is around 25µs for first access and cycles of 50 ns for subsequent cycles.

More Information


Related :


Tarjeta SD (Secure Digital)
Tarjeta SD (Secure Digital)
Carte SD / SD Card (Secure Digital)
Carte SD / SD Card (Secure Digital)
Scheda SD/SD Card (Secure Digital)
Scheda SD/SD Card (Secure Digital)
Carta SD / SD Card (Secure Digital)
Carta SD / SD Card (Secure Digital)
This document entitled « SD Card (Secure Digital) » from CCM (ccm.net) is made available under the Creative Commons license. You can copy, modify copies of this page, under the conditions stipulated by the license, as this note appears clearly.