This page explains how to repair a sd card with a window pc. Have in mind that you are now deleting something. 


  - Start diskpart (via Windows + R)
  - type "list disk" to check sd card
  - "select disk x" with x the number of your sd card. Be sure that you select the correct one.
  - type "clean"
  - type "create partition primary"
  - type "select partition 1"
  - type "active"
  - type "format fs=fat32 QUICK"
  - if sd card doesnt appear on explorer, type "assign"

Done.