[PROBLEM] Use USB as data and SD as boot device

[kabian]

Hey all,

I want to use my xbian as amusic player only. Everyone in the house can control the xbian via remote xbmc app for his mobile device. So there is no need for a monitor. At least thats the plan.

My problem: When using any remote app only, I cant play the audio files stored on the usb stick. Because I am not able to choose the desired usb storage (i can only view 'all files', which is empty).

I tried to put the usb in automount and I have tried to change the /boot/cmdline.txt (i have added: 'disk=/dev/sda1' which worked with openElec)

So is there a way to get my USB stick as the default storage/data device?
I did the following with the openElec cmdline.txt:
boot=/dev/mmcblk0p1 disk=/dev/sda1

How can I do so in xbian?

By the way: If I view via remote app and monitor, I am able to browse to 'Music -> $USB -> $Audiofiles'. And afterwards i can brose the current folder via remote app, but when i go one folderlevel above my list is cleared again.