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What is the difference between Type I and Type II CompactFlash (CF) memory cards?

The only difference between the CF Type I and Type II memory cards is their thickness. CF Type I card is 3.3mm thick, while CF Type II card is 5mm thick. CF Type I cards can fit into CF Type I and Type II slots, whereas CF Type II cards can only fit into CF Type II slots. For more compatible applications, Transcend CF memory cards adopt the CF Type I specification. 
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