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It is VERY VERY difficult to know you have a fix for the SD problem because it happens so erratically. I've had one corruption and none in one month have done practically nothing different.

One thing I did do is on Vista a directory is modified on every Sync on the SD card (like it or not). To minimize writes during a Sync to the SD Card. I deleted the directory and replaced it with a file of the same name. This breaks Media Player Syncing with Vista but I don't care.

I don't know how much that helped. But it's one less thing that writes to the card which is a good thing. If it's not writing it won't corrupt.

Only other thing I have that I have no control over is iGuidance writes it's settings where the maps are. And there is no work around.