We recently purchased a Terastation TS5410DN because it was advertised on buffalotech.com website as supporting "Advances NTFS Permissions (Windows ACL)" and states that I am able to "copy and paste existing permission structures". Thus far I have been unable to accomplish this. Using robocopy and preserving security permissions in the copy, when we move directories to the terastation, the permissions are rewritten to full control for everyone. Does anyone have any experience with this and getting the existing ACL's to transfer over to the nas?