how to reformat sd card?

If disk management is unable to format your Micro SD try to do it in the command window. To do so

• Click on the windows start orb and type in the search box cmd
• It will open a black window. In there type diskpart
• Then type list disk
• After that you see a list of disk connected to your machine. Select your micro SD card. For e.g is your hard disk is in no. 1 and microSD card in no 2 then typeselect disk 2
• After that you will see written disk 2 is now selected
• Then type clean
• create partition primary
• format fs=fat 32 quick
• exit

OR

1) CMD

2) reformat X: