Generally, write speed to a fragmented area is slower than sequential write speed due to flash memory characteristics. In an era when memory capacity is not large enough, fragmented write needed to be considered. It makes Speed Class controls of host easy.
On the other hand, even unused memory exists in total, there is a possibility that host cannot perform Speed Class recording. In that case, data arrangement to reduce fragmented area or move data to anther storage to re-format the card will be required. By using the function, it is possible to improve memory usage ratio considerably. SD Standard for Video Recording There are wide discrepancies in memory access speed depending on the SD memory card manufacturer and brand.
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