Brian,

EXACT same problem here. Have you tried accessing the TomTom internal drive from windows explorer? I left my SD card in, connected it to my computer and closed TomTom Home. I found I could access the SD card but NOT the internal drive. Couldn't explore it, couldn't format it. Nothing. Gave up and have posted it back to www.totalpda.co.uk. I am hoping that there is not a fundamental flaw in the design of the TomTom and that a new unit gets to me before I go on holiday which was one of the main reasons for getting it in the first place

Let me know how you get on.

Stuart