If you've ever wondered why the “D” on the SD card logo resembles an optical disc, it's due to Toshiba's original intent to use the emblem for their Super Density disc format in the early 1990s. Super Density was eventually combined with a number of rival formats, ultimately forming the extremely successful DVD format. The SD nomenclature and logo was revived in 1999 when Toshiba, Matsushita, and SanDisk created the Secure Digital (SD) memory card format. Since then, the format has gained much industry support, as thousands of products – from digital cameras to mobile phones - have integrated it for data storage.
Aside from offering a high volume of storage on a portable card, the SD format has a few notable advantages. First, the popularity of SD cards has led to the marketability of Flash Memory Duplicators, standalone units capable of copying data onto multiple memory cards. Second, the design of the memory card inherently precludes them from scratches, a common occurrence on optical discs such as CDs and DVDs. Third, the SD card's electrical contacts are buried beneath the surface of the card to prevent potentially damaging contact with the user's fingers. Last, SD cards were designed to be slightly irregular in shape to prevent users from inserting the card upside down.
The SD format has an official maximum storage capacity of 2 gigabytes (although 4 gigabyte cards are on the market). In 2006, the Secure Digital High Capacity (SDHC) format was created to produce memory cards with greater data storage. Most recently, the Secure Digital Extended Capacity (SDXC) format was created for even greater limits of storage capacity with cards capable of holding 2 terabytes worth of data.
SuperMediaStore carries SD cards from major memory makers Kingston and PQI in memory capacity ranging from 2 to 4 gigabytes. Our selection of SDHC cards includes cards from makers Kingston , Patriot, PQI, Adata, and Ritek Ridata with storage capacity ranging from 4 to 32 gigabytes. We also carry SDXC cards from Kingston and Ritek Ridata with 64 gigabytes of storage capacity.
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