Help SD card blank or has unsupported filesystem?

[Howlin1]

I was listening to the radio on my phone and the next thing I see is a message saying "SD card blank or has unsupported filesystem". How did that happen and how can I stop it happening again?
All I was doing was listening to the radio. I go to turn it off and my phone freezes for a few seconds and then I see that message.
Can anyone help and is there anyway to get what was on my SD card off it?

 

[avsys]

it seems like your mobile has the problem.i'm not 100% sure about it.

but you can try this if you think the problem is with the SD card.

*.insert you Sd card to a card reader and plug it to the pc(of course you can simply plug the device to the pc through the data cable, bt i'm not recommending it.)
*.fire up command prompt(cmd).
*. then type the following commands
(lets assume that the sd card got assigned with "j" for the drive letter on windows)
*. format <driveletter>: ex:-(format j: )
*. chkdsk <driveletter> /f ex:-(chkdsk j: /f)
*. format <driveletter>: ex:-(format j: )