Just replaced the original 2TB drives in my TB Lacie 2big, with 4TB WD Enterprise drives. The LaCie utilities refused to load, however I could create a RAID 0 array from Apple's Disk Utility. Black Magic reports 320MB/sec transfer over the TB1 connection, which is passed through a Cinema display. I used the largest block size which is 256k. Wonder why the LaCie Apps didn't work. Any ideas?