Confirmed using a TomTom One XL. You have to do a cold boot the first time (hold on/off button until you hear the TomTom drums or insert pin into RESET keyhole if your TomTom has one).
Also, the TomTom One XL reads EITHER the internal memory OR the SD/SDHC card. This means that if you want to use a map from the SD/SDHC Card you have to copy all of the system files to the card.
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