Although most cards are capable of writing at high speeds, this is not constant and for non mark 2 certified cards, it can drop well below the minimum and would make it unsuitable for AVCHD recording. This data needs to be written to the memory card as fast as possible, or else some data would be lost. Video cameras produce a certain amount of data every second as it captures video and audio. These cards are intended to be used on AVCHD capable video cameras. Mark 2 is a certification that is awarded to certain cards that can ensure a minimum data transfer speed. The Pro Duo is one result of this evolution that resulted in a memory card with larger capacity, faster transfer speed, and a smaller form factor compared to its predecessors. The memory stick has evolved over the years to cope with the greater demand in capacity. Sony has been producing memory cards that are meant to be used with their electronic products.
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