1. Lawyers need to deliver relevant evidence materials to the defendant or the court. The evidence materials must have copies as carriers. The cost of using optical discs is relatively low among all carriers, so they are widely used.
2. When filing documentary materials, the court usually requires electronic data to be submitted in the form of CDs. This is because optical discs, as a standardized medium, can easily store and manage large amounts of electronic data, which is helpful for courts to archive and retrieve case materials.
3. The computers and network systems within the court usually have security restrictions that restrict the use of external storage devices (such as USB flash drives) to protect the court’s network security. As a common storage medium, optical discs are usually compatible with court computers and networks, so lawyers use optical discs to provide electronic data to the court.