8jschmidt, the file system is FAT and can be read by OSX and Vista with no trouble. However I have seen trouble with XP SP2 where I will get the blue screen of death when the card is read. I have not attempted on SP3 but I know the UC520 will not read the Card Flash if it is formatted on a device other than the UC520 or perhaps another ISR.
Hope that helps,
Douglas Smith Customer Support Engineer Small Business Systems Business Unit
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