I upgraded to the latest version of ATVflash and Apple TV software and been running with no problems using external seagate freegent 1.5 TB drive. I purchased a new Seagate Freeagent 2 TB drive. I formatted the new drive as a MAC OS extended drive and copied all files and folders exactly as they were on the 1.5 TB drive. I connected the 2 TB drive to AppleTV and I cannot see the drive as mounted. Just in case there was an issue with upgrade i restored the AppleTV to factory and updated AppleTV software. Installed ATVflash again and ran SmartInstaller. I then Physically unplugged AppleTV and brought back up. Connected the 2 TB drive and still do not see the drive. Connected the 1.5 TB drive and see it still without any issues. I connected the 2 TB drive back on my mac to confirm drive and data is ok and it is.