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I've had an SDcard lose its partition table, so I want to run a surface scan of the sdcard to make sure it's physically okay. Can you suggest a disk surface scan tool that runs on the Mac? Free, preferably. Thanks.

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IMO, with the price of SD cards being what they are, if you have any doubts of the integrity of this card, throw it away and buy a new one. –  EmmEff Apr 16 '12 at 13:42
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One of my favorite Mac developers released just the tool for your task.

It's called stressdrive and writes the entire drive with data and reads it back to ensure every bit was readable and matches what was written.

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