The card coming with "new" etrex is 512mb .. but when looking at it on the card reader .. instead of just saying drive F .. it says 0101069100 (F)
Iis there some simple way to make this old but unused Etrex just accept my memory card.. ie what is the 0101069100 and how to I either get rid of it ( assuming that is the source of the snag ) or get the ""new" Etrex to just accept my memory cards.
Sounds like it is just a label set on the card. Put the card in the card reader, then you should be able to right click on it in my computer, and choose properties. Then you can enter what you like for the label.
Or try formatting the card, that will let you set a label, and could fix other possible problems.
For OSM maps, you should be able to fit most of the UK in 512MB. Depends on just what sort of maps they are, and if they include contours etc. Try using this website, you can use the option for 'manual tile selection' to just select the part you need:
http://garmin.openstreetmap.nl/Though you should be able to use a bigger card anyway. As they say, check the firmware version.