I'm building a media server with a lot of storage to hold my DVDs, music and TV shows recorded by my PVR program. The storage will be RAID-5 arrays of about 1 terabyte each. Only data will be stored on these arrays the system drive will be a separate and much smaller disk. Do I need an anti-virus to scan the data drives or just the system drive? If I do need to scan the data drives, what anti-virus can scan drives that big holding multi-gigabyte files without taking a day or more? Also recording video to a drive is very sensitive to disruption. I dont want to have a capture of a TV show ruined because the anti-virus suddenly decided to kick in. I've read NOD32 has very fast scanning but I dont know whether its real time scanner would cause problems. Perhaps an on demand only anti-virus would be better.