TomTom home grief

There a few things more annoying than fighting Windows to try and get something working that used to work fine but now inexplicably does not.

I am the proud owner of a TomTom Go 720. A fine piece of kit and relatively trouble free until a couple of days ago when it stopped connecting to TomTom Home. I would plug it in and although I could see the unit in My Computer, TomTom Home would tell me "No device connected". I ran through everything I could find on the net - resetting, copying the files over, reformatting, copying files back, but nothing would work. In the end it turned out that at some point it had assigned drive letters to the TomTom + its SD card that conflicted with my network drives. So the TomTom SD card was being hidden under a network mount letter. The fix was simple. Go to:
Control panel -> Computer Management -> Storage -> Disk Management
and then reassign TOMTOM and TOMTOM SD to free drive letters well after anything already in use. As soon as I did this the TomTom appeared in TomTom Home and it asked me which memory to use; internal or SD. It obviously had got in a huff due to the SD memory being hidden by a network mount (in my case drive L:).

So happy days eventually. Hopefully this will be of use to someone else as I couldn't find any solutions suggesting this course of action at all.