We have a Drobo Pro we are using for our user backups. 8 1 TB drives. Have about 30 people currently using the built in Windows NT backup at random times from their machines. Some times at the users machines we get a notice of delayed write. I restart the backup on the user machine and all is fine. The Drobo Pro is on a windows 2003 server with usb connection and is shared up for all to see. Users are xp and McAfee is our antivirus. I have read conflicting info… that possiblily the anti-virus is the cause. Also would I be better served connecting with firewire, or iSCSI? We have vlans here so I know my old droboshare hated those. Would the iSCSI be seen across the vlans?