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normally when this occurs, its means the SD card is dead and u will need to replace it.
try connecting the sd card into a different computer or another external SD card reader. If it shows up . right click and click format. If it says it cant format it it means the card needs to be replaced.
Sorry. You can't. But you can usually recover use of the card by inserting it into an external SDHC card reader (using a suitable micro SDHC to SDHC adapter) and then refomatting the card. You may need to use the host computer to go into the cards properties first to uncheck the "read only" status.
This makes all data stored on the card overwriteable as if it's no longer there, but there is plenty of free/cheap data recovery software which can recover data from reformatted memory cards as long as the card has not been used after formatting.
Garmin maps on SD card are not intended to be useful outside the GPS. You can't download the data to use elsewhere, use it in Mapsource, etc. Only in the GPS.
This is why it is common to buy the DVD version and install the mapset on your own SD card.
I believe this is the root of the problem. If you believe the card itself is defective give Garmin a call/email and they will replace it. It is not likely the case, though, based on my experience helping people with Garmin SD problems.