I recently had connected an external hard-drive to an old 1st gen time capsule and successfully used it for backup. However, my TC began shutting down on me so I thought it was time to get a new one. Now my new TC will let me choose my external drive but as a backup but cannot seem to login to it. It keeps complaining "problem with the network user name or password. However, I know this is right.
In the Mac Help doc, there is one section that reads:
Every available disk that can be used to store backups is listed. If you’ve partitioned a disk, the partitions are listed. Time Machine can’t back up to an external disk connected to an AirPort Extreme, or to an iPod, iDisk, or disk formatted for Windows.
OK, so if this is true, why did it work before? Why does the app let me select the drive as "Available"? Could the reference in the Mac Help to AirPort Extreme refer to just the base station and not the time capsule?