I dont know anything about xebian, but I know alot about softmods, and if your running evox, in a softmod, your HDD is DEFINATELY LOCKED! if you unlock it and reboot, your softmod wont work... so be careful what ya do.
if xebian is reporting the drive as unlocked, something is definately wrong.
hda50 is E DRIVE
hda55 is F DRIVE
if giving the option, install to F