- exchangeable disk storage
- 可变: variable; changeable
- 换: exchange; barter; trade
- 的: 4次方是 The fourth power of 2 i ...
- 磁盘存储器: magnetic-disk memory; disk f ...
- 磁盘存储器: magnetic-disk memory; disk file (memory); disc [disk] storage; disk storage unit; magnetic-disc [disk] store; disk type store; disk memory
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