Originally Posted by Jiyeon90
The Phone has to be turned off in when you insert/take out the SD card otherwise you can mess something up
I agree with you on this one, this is the safest way but the feature of the card and phone is Plug&Play so it should work too even powered on.
Try this way, reboot the phone with the card insert into it, then click "Unmount SD card", wait until message will appear "now you can remove the card" then a message will be on the phone saying, Card Removed, close all the notifications and go back to menu, wait a minute, insert the card again. Do you read the card?