Hey dudes

i bought an ASUS SBW-06D5H-U external drive. This should read and write blue ray discs. After some problems with my laptop identifying this device it worked so i could see the drive at hardware manager.
Now i got a blue ray box from Planet Earth II. There are two kínds of blue ray disc
1. 4k Ultra HD blue ray
2. full HD blue ray
when i insert the 4k ultra hd one nothing will happen. The ASUS drive does not identify any media ...
when i insert the full HD one i can watch it on my pc without problems ...
what is the point here ? are there any restrictions which quality can be played by the drive ???
any help is realy appreciated
