There are lots of devices for data storage such as the disc, HDD, and the Flash. And in comparison to the other two devices, there are some advantages to discs:1. Except R/W discs, data will not be erased once the discs are burned.2. Discs are cheaper than HDD, USB, SD, microSD, etc.3. Once your source HDD is damaged, it costs time and money to fix it, and it may not always work. However, you don't have to worry if your source data is burned on a disc.4. It is easy to share and distribute data by discs.5. Most people have their own disc reading devices such as the PC or the CD/DVD/Blu-ray players.