No, the data disk capacity cannot be directly combined with the system disk capacity. They are separate storage entities with distinct roles: the system disk stores the operating system and essential boot files, while the data disk is used for additional storage needs like applications, databases, or user files.
For example, if your system disk has 50GB and your data disk has 100GB, you cannot merge them into a single 150GB volume. However, you can manage them independently or use storage solutions like Tencent Cloud's CBS (Cloud Block Storage) to attach multiple data disks to a single instance, or leverage Tencent Cloud's CFS (Cloud File Storage) for shared file storage needs.
If you require a larger unified storage space, consider using Tencent Cloud's CFS or Tencent Cloud's TStor for distributed file systems, which can provide scalable and shared storage solutions.