Lumia 520 SD card Scanning issue

[Jajna]

Well! I don't know if anyone is aware of this. If anyone knows plz help me. 4 to 5 days back, my Lumia shows a notification your memory card is not working scan your SD to resolve your issue. I clicked the scan option in my Lumia 520. And after few minutes it says issue has been resolved. Now my question is how I will do it manually. Next time if i will get that option again I will post the screenshot. Thanks...