A separate housing containing a CD, DVD, or Blu-ray drive that connects to a computer via USB or another interface provides portable access to optical media. This allows users to read and write discs on computers lacking an internal optical drive, such as ultrabooks or tablets. For example, one might utilize such a device to install software from a disc or create backups on DVD media.
The portability and compatibility offered by these devices are invaluable in an increasingly digital world. While cloud storage and digital downloads are prevalent, physical media remains relevant for archiving, software distribution, and accessing legacy data. These external solutions bridge the gap for systems without built-in drives, ensuring continued access to optical media. Their evolution mirrors the shift towards smaller, more portable computing devices, offering a persistent link to older technologies.