SD card is not used to store data

[srobert2]

Hello all,
I have an issue after I use de pandory tool to jail break a 18s 3d+wifi pandora box.
the sd became corrupted
I have insert a new sd (exFat).... it is well display in df but when I add new games it goes in the internal storage....
it looks like the sd is mounted correctly but games data don't reach it......
note that I can access de box with telnet et ftp
anybody can help me?
Stéphane