I tried moving 100GB of data back and forth on my LAN, no problems at all. Even with MD5 checks. 1) check NICs as they are cheap and flakey 2) check routers 3) check cables In my shop I recently installed cat 6 so I am not worried about it yet.Vote if answered or helpful, I am running for Office (joke)! IT/Developer, Windows/Linux/Mainframe Server: ASRock P4-2GHz, 1.5 GB RAM, Linux Server, need IDE/SATA disks for my chess site Workstation: Asus M2NBP-VM CSM, Athlon64 X2 4200+ 65W CPU, 2GB RAM, x600, 320GB + 160G backup, Windows 7 Ultimate x64.