Computer Applications 2Computer Technology

HistoryOf the SD Card

BY Marquis ParksPeriod 1

1997• MMC was unveiled in 1997 by Siemens AG and SanDisk, it is based

on Toshiba's NAND-based flash memory, and is therefore much smaller than earlier systems based on Intel NOR-based memory such as Compact Flash

1999• In August of 1999, Panasonic, SanDisk, and Toshiba first agreed to

develop and market the SD (Secure Digital) Memory Card which added support for DRM and a higher memory density. The SD card also introduced the Serial Peripheral Interface Bus

2000• At the 2000 Consumer Electronics Show (CES) trade show, the

three companies announced the creation of the SD Card Association (SDA) to promote SD cards. The SD Card Association's headquarters

2004SanDisk released a memory card with a 1 GB capacity. It cost about $500 and had enough memory to store 300 MPS files or 2,000 images at 1600 x 1200 pixel resolution. Today, a 1 GB SD card can be purchased for anywhere between ten and twenty dollars and could be considered insufficient by many users

2005•2005, the SDA announced the small microSD form factor (and SDHC, with capacities in excess of 2 GB and a minimum sustained read and write speed of 17.6 Mbit/s).

2003

2006•In 2006 the SDA released a simplified version of the specification of the host controller interface (as opposed to the specification of SD cards) and later also for the physical layer, ASSD extensions, SDIO, and SDIO Bluetooth Type-A, under a disclaimers agreement.Again, most of the information had already been discovered

2009• 2009, Pretec introduced the first SDXC card,a 32 GB card with a read/write speed of 400 Mbit/s.

SD card

2010•2010, commercial SDXC cards appeared from Toshiba (64 GB),Panasonic (64 GB and 48 GB),and SanDisk (64 GB).

2011, SanDisk released a 64 GB microSDXC card. Kingmax released a comparable product

SD card

2012, Lexar released the first 256 GB SDXC card, based on 20 nm NAND flash technology

SD card

wikipedia File:SD Cards.svg http://en.wikipedia.org/wiki/Secure_Digital

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