Memory card access blocked

[cyberteen]

Hi,

I have an 6 day old 8gb san disk micro sdhc mem.card bought from flipkart.
I am using it in a samsung corby gt-c3510. Till today noon, it was working fine without no issues.
Today to transfer some files, i removed my memory card from my phone and inserted it in a nokia 5130 exp. music set.( i dont have my samsung data cable) to transfer some data. but the phone couldn't recognise.
So, i put it back on my corby, but now it does not show any sign of memory card. in my MyFiles(file explorer) it shows me the card tab, but when i try to open it, it says not allowed.

Now even my computer is not recognizing it. Pls help me. Its a brand new. It has never fallen down even once. Scratchless.