The reader will access the information so the computer can handle it. If you wish to use an SDHC card you must have an SDHC card reader. The situation is being further complicated because there is now an XC (extended capacity) card on the market which has a capacity of 2 terabytes 2048 Gigabytes but this is at present being limited to 64 gigabytes by the SD 2.0 documentation.
With the advent of high capacity cards the block capacity was increased from 512 bytes to 10 giving a capacity of 4096 x 2048 x 2048 = 32 Gigabytes, and these cards can only be formatted to the FAT-32 file system.įor this reason an SD card reader will not recognise the data stream from a SDHC card. This meant that any computer or host type device would recognise them through a card reader. These cards typically came pre-formatted to the FAT-16 file system with the MBR partition scheme. This gave a card capacity of 4096 x 512 x 512 = 1 Gigabyte. In the original SD format it stores 4096 clusters with up to 512 blocks, each block containing 512 bytes of information. It stores blocks of binary information in 'clusters'. Firstly one must understand exactly how a memory card works.
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