Default Archos can't see ext4 partition mounted at /mnt/storage/sdcard

Ok, so I rooted my Gen8 and it's working great. I can even tether my Blackberry now.

However, I can't access the third ext4 partition on the SDCard.

I have it mounted at /mnt/storage/sdcard just like it mounted the old FAT32 sdcard, but none of the apps will recognize it.

I've searched but can't find anything on this. Any advice?

Thanks.