The card was/is a brand new Sandisk Ultra II 2gig that I'm trying. And as of now I don't have any other card to try (have lots of 512k laying around).
The TT One won't recognize the card after installing application and North America map from latest map DVD. If I take the same card and put it in a card reader the apps, maps, data show up. Comparing it to the OEM SD card, it looks similar in what is on each card.
I will (a) try again later, and (b) probably pick up another card later today.
I'm still not convinced the card is not faulty somehow, ie - format?
Does the ONE behave normally when you put the OEM card back in?
I would check your format selection. Most cameras I have run into use FAT format, not FAT32. Took a old 1GB SD card that I had and re-formatted it using FAT. Works fine in TomTom One.
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