The older, original TomTom's - like the 300 - had an SD card that contained
the maps.
The 700 model had the mini hard drive. Mine has an SD and Mrs.E.'s has the
hard drive.
Both can still be updated via the Internet download, but I haven't bothered.
Hmmm - I thought Jim had the TomTom One.
Which has a slot for a SD card, but the maps are preloaded.