A device that provides medium-capacity random access. It is designed for use as an extension of internal main memory, main storage for operating system and working programs, or where fast direct access is the primary consideration.

• 一个提供中等容量的随机存取设备,设计为内存的扩充,作为操作系统和工作程序的主存储器,或在主要考虑快速直接存取的地方使用。