Thanks for the help .I tried ext 4 with 4 partitions so they would be 2 tb each like you suggested and tried to format. It just said format failed. I did a search about the max size hdd before I bought the hdd and all i could find was the old Ultimo had a max size of 2tb. I couldn`t find anything on the 4k box.On another forum when they tested the box it said a sata or Nas drive could be fitted so I went for sata as it was meant to be quieter.