Hi, you can try this:
Try formatting it in Disc Management which you will find in Computer Management.
Start. Control Panel, Administrative Tools, Computer Management, Disc Management in the left hand column, right click
on your flash drive/sd card and choose format. You may get a message This volume may not be compatible with previous
versions of Windows etc ignore this and click ok This is because the pendrive/sd card is FAT and the hard drive is NTFS.