Seagate Showcase 500 GB EHD unit no longer recognized (as of 11-5-09) by my 622. Been working just fine since 8-8-09. Plug the same device into my PC at work and it sees it as a valid USB Mass Storage Drive. That would pretty much eliminate a hardware problem at the drive level. Any ideas? Numerous reboots of 622 don't help. Software on 622 is current. Both USB connections on 622 give same error. This almost smells like a software glitch.