our filesystem is bigger than 4 GB (approx. 60 GB :-) ). Are 11 bits for the
   device really necessary ? I have now idea for what it is used for ?

fyi,

here's how i'm currently using device/inode bits:

       1 bit  = file/directory identifier    
       4 bits = major device #
       3 bits = minor device #
      24 bits = inode

-a

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