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SD Cards get new 300MB/s bus

SD Cards get new 300MB/s bus

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In January this year the SDXC format was announced which offered a maximum capacity of 2TB and 104MB/s transfer rate. The new technology called SD 4.0 is going to increase this to around 300MB/s – effectively tripling the data transfer speeds.

4.0 uses the eXFAT file system which means the storage capacity will stay at the 2TB mark, more than enough for consumer requirements. eXFAT is the new 64bit version of Fat 32 and is being heavily supported by Microsoft within their new windows operating systems.

This upgrade will require a new pin configuration, increasing from the current nine contacts on the edge of an SD card to ten. The extra pin will handle the serialised data stream to accommodate the extra bandwidth and the cards will be fully backwards compatible meaning they will not change size or shape.

The SD 4.0 card release will be around April 2010 and they should be popular with HD video camera configurations.

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Stuart Davidson

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