Pretec has announced today the highest capacity SD card in the world, the Pretec 8GB SDHC.
This model 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).
SDHC cards are recognized 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.
In the summer of 2005, Pretec was also the first company to launch 4GB standard SD cards and now it also offers 4GB SDHC cards.