No access to the external sdcard [SOLVED]
Device: GT-9505 jfltexx (jflte)
ROM: SlimKat build 4
Kernel: ROM stock kernel
The problem is that I can't activate the external sdcard from Settings/storage. When I press "Activate sdcard" the "Preparing sdcard" notification appears in the status bar but it never ends successfully, so extsdcard, sdcard1 and other else folders are empty.
The point is that external sdcard is accessible via recovery, I can restore and so on from it, but I don't find the way to make it readable into the ROM. Any help will be much appreciated. Thanks in advance.
P.S. Just flashed the ROM and Gapps after using the "Clean to install a new rom" feature in Philz Recovery. I haven't done anything else.
Edit: I formatted as fat32 as I was suggested and now is readable in the rom. I still don't have the slightest idea about why a card is readable for a rom and not for another. I'll do a deeper read about that. Now I have the typical-misterious-and-unreasonable sandisk-64Gb unmountings, but that battle is lost and I know it.