Hey, what do you mean by? You want to format your memory card on purpose, or you mean your computer shows memory card needs formating which can not be formatted? If it is the former, you can point to your memory card, click the right button and choose format option.If it is the later, your PC shows this like 'the memory card is not formatted, would you want to format it now?'. You must use recovery tool to recover your data first. Then what you need is merely 4Card Recovery is the best one.