Default (q) sdcard problem in cm10.1

to the point,
why i can read my sd card in cm10.1 rom, allways "usb storage sd not currently mounted" in setting>storage,
it's happen in all cm10.1 romb base,
i'm try to flash kikat ui v2, future next rom, and pure cm10.1.6 rom, and the problem is same,


sorry for my bad english