Mac USB connection 550 not recognised

chickenlegs Registered Users Posts: 13
Apprentice Traveler
Should I be able to see both the TomTom and associated Micro SD Card in Finder on a Mac when my TomTom 550 is connected to my MacBook?
I have a successful connection between the MacBook and the TomTom via the USB cable provided as the screen on the TomTom has changed to show the cabled connection in place.
However, I thought that I should be able to see the actual physical drives on the Mac, but nothing appears. I have looked in Disk Utility and nothing appears.
I understood that this was a method of transferring data from one drive to another, but I can't seem to see either on the Mac.