Hi John. The PolargraphSD uses the standard arduino SD library (http://arduino.cc/en/Reference/SD), says
The library supports FAT16 and FAT32 file systems on standard SD cards and SDHC cards. It uses short 8.3 names for files.
I've never had to try a mac-formatted sd card so I'm not sure what it's default format is. I'm assuming if it reads it at all, then the format is ok though. Maybe long filenames?
The actual reading routines are very simplistic, it should show up every file on the card (regardless of format and extension), and will read any file too. Only the text files that the controller outputs will make any sense to it - anything else will have unpredictable results. The "export queue" function just saves a very vanilla ascii text file.
Let me know how you get on, I don't have a mac, so I can't test any of this stuff myself.
good luck!
sandy
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