According to WeaKnees, the installation process only takes a few minutes and then the AppleTV will re-synchronize with your iTunes to download all of your music, videos, and photos. The hard drive is fully prepared by WeaKnees, customers simply use the included tools and instructions to remove the existing drive and install the new one.
Kits Include:
• New 160 GB Seagate drive with 5 year Seagate warranty (six month WeaKnees warranty)
• Torx T8 and Torx T10 tools
• Installation instructions with pictures
• Phone, email, and forum support
More info: http://www.weaknees.com/appletv/apple-tv-upgrade.php