For this, insert the memory card into the card reader and connect to the computer. Keep in mind that the memory card file can not be accessed as it looks like other disks or hard drives, but the file system is OK. Now go to the Windows Start menu and enter cmd. This will show the command prompt (cmd) at the top of your Start menu. Now press the right button on it and select Run as administrator and open it. Command
Type at the command prompt chkdsk mr and press enter. Here is the memory card drive m.
Enter the drive letter of the card on the computer and enter the check disk.
Convert lost chains to files, press y here. If the file structure is correct then the card information can be used again. If the memory card shows an invalid file system, right-click its drive and click Format. Select FAT from file system and check Quick format and click Format. The card will be lost if the data is lost even if the format is completed ...