I have a 4 gb micro sd card ,now my memory card is not properly working and when i insert card into phone it shows card is write protected.. it even not recognised in system give me a helpful solution to recover my memory card..
Are you using a MicroSD to SD adapter(something like this)????
If yes, note that there is a switch on the upper left side. It locks the SD to read-only state. Check it and change the switch and then you can write files/photos on it again.