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I went and bought an expensive SanDisk Extreme III SDHC 8GB class 6 chip.
However, when I dump data from the card to the machine via a USB 2.0 cable, it's only getting 5.0 MB/second maximum according to Windows 7's disk explorer. It still can take up to 20 minutes to dump the card when it's near full.
This is so far below the rated 20 MB/s transfer speed. I can't believe it.
Is this normal or might I have a defective chip?