Some times our Memory Cards stop working after we have formatted them from our Computer and not from mobile. If you read user manual of your Mobile you will find a warning message asking you not to format phone memory of your mobile and memory card from computer, you should use mobile.
Memory Card use FAT16(FAT) file system and through your computer you can format it into only FAT32 and NTFS file system and if you format it with any of these two file system then your memory card will stop working in your mobile phone.
The solution of this problem is to format the Memory Card again with FAT(FAT16) file system through computer because your mobile cant read it any more so you cannot format it from your Mobile.
To fix this issue follow the steps given below.
To format your Memory Card with FAT (FAT16) file system, follow the steps given below:
1. Plug-in your Memory Card into your computer.
2. Wait till computer detects the Memory Card.
3. Now note down the Drive Letter of your Memory Card.
Note: In this tutorial we will assume that drive letter of your Memory Card is H: but you should replace it with actual drive letter of your memory card.
4. Now run Command Prompt by Typing CMD and hitting Enter in Start>>Run or by typing CMD and hitting Enter key after pressing WinKEY+R.
Windows 7 and Vista users should type CMD in Start’s Search Box when Command Prompt appear, right click on it and run as administrator.
5. Once Command Prompt launches, Type H: /fs:FAT and hit enter.
Please note that in above tutorial we assumed that H: is drive letter of memory card but this could not be same in your case so make sure to replace H: with actual drive letter of your Memory Card.
Also Please note that if you format anything your data will be erased.
Once your Memory Card is formatted, You can start using it your Mobile.