is yours a SD HC ?

 

decided to upgrade my sd card on the tomtom and bought a 4gb SD card it says SDHC on it, which is absolutely the same shape as my tomtom's card but when i put it in, i cant do anything with ? Is it because its a different format ?

 

yep, unless your tomtom supports sdhc, you won't be able to use it. If it does, it may need formatting

 

its tom tom one, do you know if it does ?

 

it depends on the software version that your One is running...

TomTom made a few changes to the system software / firmware earlier this year to allow virtually all models (old and new) to use SDHC cards. If I were you I'd use TomTom Home on your PC to upgrade your One to the latest TomTom software version and try again.... it should work.

I've got a 4GB card in my GO500 which works fine...

DN

 

Just incase someone else finds themselves with a desire to update their SD card on tom tome ONE = dont buy SDHC cards, tomtom one doesnt support them even with the latest firmware.

2 gig SD cards is the biggest it can support