Help me!!!! cant format memory card sony ericsson

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Hi all. use sonyericsson mobile and use mini sd memory card,but i only heard music from memory card, cant format it. When i format it from my pc then it have error "this driver has been write proteted". When i format it from my mobile,i wait about 15 minutes and my mobile dont use, i must replace pin and restart my mobile to use.Plss show me the way to format it.