Garmin GB discoverer, how to copy maps from original SD card

Hi,

How do I copy the files from my garmin GB discoverer SD card onto another SD card, I put the SD card into my pc but it shows as blank when i know the maps are on there? The card is a genuine garmin not a downloaded one.

I have all the keygen stuff under control (have used this on other maps in the past) so just need to get the files onto a new card and happy days!

Can anyone help?

Cheers.

Anyone have any ideas?

You sure map is the SD card ?
Try with property on SD and see used space.
If the map is there ... find it :)
Mark show hidden files/folder in windows XP/7 option.