The SM-348 is a 48x24x48 CD-RW and a 16x DVD-ROM all in one unit. With small form factor PC's such as the Shuttle SB51G and the AMS gBox gaining popularity, people have some serious decision-making to do when it comes to filling their single 5.25" bay. Previously, choices were limited to either a CD-ROM, CD-RW or DVD drive. In order to have 2 drives, an external drive would have to be added, but not with the Samsung SM-348.