Pretec 8GB SD card is fully compliant with SD 2.0 (SDHC) specification with access speed up to 20MB/sec. The maximum capacity of SD card is 2GB under SD 1.1 of Secure Digital Alliance (SDA) specification; however, by using file format of FAT32, many SD 1.1 host devices can use 4GB SD card which Pretec pioneered since 2005. SD 1.0/1.1 uses traditional "Byte Addressing" scheme which limits the maximum capacity to 4GB while SD 2.0 adopts "Sector Addressing" scheme which is the same with the technique applied by Mu-Card Alliance in 2004 to reach the maximum capacity of 2TB (2048GB). Pretec is one of the major founders and main contribution member of Mu-Card Alliance, who joined force with MMCA in June 2005 (www.mmca.org/press/Mu_Card_Final.pdf). With capacities of 2GB, 4GB, and 8GB, Pretec 8GB SDHC is now available for key customer sampling at unit price $299. Mass production is scheduled by Q4/2006.
SDHC cards are recongnized by new SDHC host devices differently than standard SD cards and are not backward compatible with legacy SD format host devices; in which, SDHC cards can only work with SDHC compatible host devices. Since Pretec is the 1st in the world to offer 4GB standard SD cards, and now also offers 4GB SDHC cards, Pretec will provide patent-pending SD-TunerTM technology for customers to have an easy transition between the incompatibility of SD 1.1 and SD 2.0.
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