Mere pas 2 memory cards hain , ik 4gb ka hai or dosra 8gb ka hai, 4gb wala 30mb show krta h computer mai lkn naa mbil m show hta h or na computer per open hta hai , jb mai format krta hn to format bhi nhi hota "window unable to format this sd card" ka error ajta h , command k zariye b nhi format hua , koi esa software bta den jo isko thik kr da , or dosra memory card show he nhi.hta,