This adapter supplies power to your Hitachi or Toshiba-Samsung ODD (Optical Disc Drive) from your PC so you can connect direct to Sata without any fuss. It also has an eject switch and a debug (modeb) switch for Hitachi drives. The adapter is incredibly convenient and perfect for those who dont want to have the Xbox 360 hooked up to their PC so you dont have to move all your equipment / get behind your TV to unplug your video cables and mess around with that huge power supply if the Xbox 360 is in another room, and it's also for those who want the to use Debug Mode or have the eject option without any other cables. It is especially ideal for those who happen to have a spare Xbox 360 ODD. It's all about CONVENIENCE!