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There are hardware incompatibilities between SD and SDHC cards. They're upward compatible in that SDHC devices will accept SD cards but not the other way around. You will have to hunt down SD cards, 2GB and smaller.
You cannot use a sd card from another tomtom. The sd card is coded for each individual device. About the only thing you can do is to purchase a 1 gb card (no larger because it won't be supported). Insert the blank card into your unit and connect it to your pc. Go to my computer and see which drive the tt is. format the card and then open tomtom home. This will load your operating system back onto your card. I don't know if you can download a free map or not. Check the tomtom forums for more information concerning maps.
Hope this helps