from Engadget

While thousands of people were enjoying their Apple TVs last night, we decided to take ours apart for some pictures and to upgrade the drive. Seriously, 40 GB is smaller than our iPod and we don’t like to have to pick and choose what to sync. While there is little doubt that this will void our warranty, isn’t it worth it?We decided to double the size of the HDD from 40 GB to 80 GB; we picked up a new 5400 RPM IDE laptop drive and went to town.

You’re going to need a few other items to perform this upgrade — besides the Apple TV and the new drive, of course. First you’ll need a TORX 10 driver to remove the screws and some spray adhesive to reapply the rubber mat on the bottom of the unit. You will also need either an external 2.5 inch drive enclosure or a USB to IDE adapter like the one shown with a 3.5 inch to 2.5 inch adapter.