Hi, Had a Macbook that has been backing up fine using Time Machine to a Hard Drive attached to my Airport Extreme. Now a proud owner af a 20" iMac set it all up and also done the firmware update for my Airport. The problem I have now is that my MacBook and iMac can't backup using the hard drive attached to the airport. I have tried reformatting the hard drive, both mac's see the hard drive in finder, both macs can backup to the drive if it is connected directly via usb. really annoying - has anyone got any other suggestions?