The Apple TV comes with a stripped-down version of Apple's OS X, but retains many of its basic features, such as directory structure and file format. In just over a week, hackers have been able to upgrade the Apple TV's 40GB hard drive (derided by many as being too small for any serious media collection) and enable secure shell access (SSH) to the machine, among other things. Most recently, and the most practical hack so far to date (announced on March 29) is to enable the USB port, which had been disabled by Apple in software.