[PROBLEM] External HDD periodicaly disconnected and reconnected as RO

[IriDium]

As you are on Beta 1.1 I would check for the dbus issue.

Also, do you need the disk mounted prior to XBMC being started. What could be happening is that fstab is mounting the disk but when XBMC starts, it recognises the USB drive and try's to mount it again.

Try removing the entry from fstab and see if the problem still exists.