Moserbear 4gb pendrive
PEN DRIVE NOT WORKING SHOWING INSERT PENDRIVE

Sir,

I have problem from my moserbear 4GB pendrive which i just purchased 15 days before, i have brought it from reputed shop in SRINAGAR with bill, after inserting pendrive, it says "INSERT A DISK IN TO DRIVE F" .and it shows "0 free space and 0 used space" & And i have checked my pc's usb drivers. all r good and also try it with my friends laptop but again the same problem. How i can overcome this problem, plz help me as soon as possible