main aik mp4 file apne pc se memory card mein copy kr raha tha k aik error aaya " invalid ms-dos function ".... then woh file copy nahi hui..... kuch der baad maine card ko mobile per lagaya to woh file to nahi thi lekin card bilkul theek chal raha tha yaani corrupt nahi hua tha.... magar ab jab bhi main uss card ko pc per lagata hoon to pc per show nahi hota.....lekin mobile per sahi chal raha hai...... poochna yeh hai k yeh problem kaisay door ho? aur card ka problem hai ya card reader ka?