Well, I don't own either a iMac (or any mac) or a SDHC card, but I can tell you that with a regular SD card, there is a switch on the side that makes it write protected. check to see if there is a manual write protection switch on the card. Otherwise see if you can view the properties of the card and change the setting from read only to read/write
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Hawk Pettengill
I gotta White 3G 16GB iPhone.
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