I have a home network consisting of three wired PCs, one wireless notebook PC, and (when my college daughter is home), a MacBook. For backing up files, we all back up to an external USB hard drive that's connected to one PC; he PC must be turned "on" in order for anyone to back up. The two laptops connect through an AirPort Extreme that's connected by CAT5e to our wired router. Last night it occurred to me: Why not connect the backup drive to the AirPort's USB port? That way, the drive could be used by anyone, anytime. To my surprise, our wired PCs can't see the hard drive. It doesn't show up under "My Computer" or "My Network Places." I haven't tried finding the backup drive with my wireless laptop; I assume that the laptop, at least, will be able to see it. The AirPort is wired to the main router; should anything connected to the AirPort be visible to one and all? Have I left out a step?