Summary: The drive is perfect. It reads and writes - including 25GB Blu Rays. According to the box label, it will read and write 25 GB M-Disc also. Installed in a standard (half height) drive bay and Windows 7 recognized it right away. Have to jump through the hoops to process the promised $25 rebate.
Excerpt: I burn a variety of media, CD, DVD, Blu-Ray, fairly often. This drive would not read or burn CD's from several different manufacturers, though it was fine with DVD and BR discs. Asus tech support was not helpful, even though it was clearly demonstrated there was an issue with CD compatibility.
Summary: This is a must have for serious builds. Best I've ever owned, and the software that comes with it installs necessary drivers flawlessly. Has the ability to record data and video storage well beyond the traditional 4 GB disks to up to 128 GB's respectively.