Frozen Micro SD card, please advise

I have a 2gb micro sd card (Sandisk) & cannot delete, copy, move, or add anything to it!
It was working fine on my sons DS with his R4, I tried to fix the Legend of Zelda with the arm 7 patch, and couldn't fix the black screen so as I and read on the downloads here that the other Zelda game worked fine I tried to delete the old game and download the new one ...I cant do anything, and cant back up either!! Any ideas?
Tried a variety of different readers and 2 different computers, no joy and other Micro SD cards work fine. It will still play the other games on his R4...... thanks from a now getting desperate mum , who has spent a good few hours trying to sort this !!

have you tried reformatting it?

The only thing you can do is reformat it, i know it sucks i've had to reformat my brother's many times and its very frustrating, but it is probably the only solution.

Yes I havent tried refomatting - wanted that to be last resort incase any other ways to save some of the save files.... thanks

Backup your data :)

that's the trouble - I cant back it up, cause it wont copy, cut, or move or anything! Unless I have missed a trick?

Nope, sorry, the only thing you can do is reformat.

If you use the thing where you stick your micro SD card in that came with the SD, see if it isn't on 'lock' otherwise reformat