@Hockeymetz try formatting with a free tool called (miniaide fat32 formatter) and don't unplug the hard drive from the cdj while flashing usb light it will corrupt the drive and will have to be reformatted.i suggest delete all partitions create a new partition and then format,1TB should not give issues 2TB will be slow and sometimes freeze if you have it full 3TB i think it's too much i tried with a 5TB and it did not work,good luck .