Development course of SD card

MMC card was born on the basis of SM card, not the SM card developed by Toshiba. A few years later, SD card developed on the basis of MMC card replaced MMC card and became the memory card format of almost all portable digital products. In 200 1 year, the market share of SM cards exceeded 50%, but it dropped to about 40% in the middle of 2005 and soon slipped away. Most digital camera manufacturers provide SD card support, including Canon, Nikon, Kodak, Panasonic and Konica Minolta. In recent years, the professional camera market has also been eroded by SD cards, and the high-speed and high-priced CF cards are destined to be completely replaced by cheaper and higher-speed SD cards in a few years.

SD card is made by Toshiba adding encryption technology to MMC card technology. Because MMC cards may make it easier for users to copy digital music, Toshiba added these technologies, hoping to reassure the music industry. Similar technology is Sony's MagicGate. Theoretically, encryption technology can introduce some digital rights management measures, but this function is rarely used.

Users can use USB card reader and SD card on personal computer. Some new computers have built-in card reading devices.

The "SD" trademark is actually used for another completely different purpose: it was first used on the "ultra-density optical disc", which was developed by Toshiba and lost the battle for DVD format. That's why the word "D" looks like a CD.

SD series memory cards will be sent to SD card association for certification after SanDisk completes the test, so almost all patents are in SanDisk's hands. But in 2007, SanDisk sold his possessions because of the turmoil in the NAND market, giving the outside world an illusion that it is about to disappear. I lost many of my core technologies and patents, and the most important NAND factories were sold to Micron. Not long after, Sandisk, which has re-attracted foreign investment and changed its face, has no intention of developing flash memory technology and establishing a new factory. Instead, we invest in Toshiba, cooperate with Toshiba, and use Toshiba's manufacturing technology and technology to produce chips. After that, Toshiba's new products will have two brands of LOGO. SD card is no exception. There are many similarities between the products of the two brands, which are also the main sources of SD card market.