I use XP Pro SP3, (32 bit), on both computers. When the sit long enought, they will hibernate by them selves. I beleive NIC power saving is enabled, the machines will wakeup if a request is sent. I do not have any trouble accessing either computers at any time. If I turn on the 323, hub & computers it will work fine for a long time, 3 or 4 hours, but then, it seems like the 323 looses connection with the drives. Windows says path not found, the connection has not been restored. I can still access the configuration through Internet Explorer, I can still access the download section, (but not download from a local computer), I can set downloads to copy from one volume to the other, (but the computers cannot access the volumes on the 323, and can access r the other computer).