You could try here as well as for I done some heavy research over this topic
and have tested these files and methods across many of phones and devices.
you can also download RE/MOUNT sd from google play store it instantly worked.

And if you trying the links I provide from android app on the phone for unknown reason it is taking me to the wrong posts it keeps going to some other T-Mobile post instead but when I try my links from a PC it goes to the correct address :thumbdown:

this link is from s3 kills sd cards! it is just one of many suggestions.
you may want to go and take a look..
http://androidforums.com/6775545-post558.html

this is the second link from there I have posted
http://androidforums.com/6757961-post552.html

Thank you and sorry for any loss you may have as I'am sure this will be of great help to you.

 

Can't wait for a sweet (pun intended) rom of Lollipop, big fan of it.

 

Me too bro. Aparently Noname Rom have a 5.0 for the i9300 thats "mostly" working already..... :thumbup::thumbup::beer: