Hacking Mounting USB?

[pembo]

Do I need to do anything special in the C code to work with a usb drive from a homebew app?

To access the SD, I normally just do:

fatInitDefault()

and then I can access through fopen

sd:/apps/xxx/xxx

If I try to access the usb through fopen as

usb:/apps/xxx/xxx

following the fatInitDefault then I can't seem to access the files and I'm not sure why

(The drive is FAT).

Thanks