However, Shared memory does not provide any access control for processes that use it.
不过，共享内存不为使用它的进程提供任何访问控制。
Just two years earlier, IBM had also developed the first random access disk storage device, the random access Memory for Accounting and Control (RAMAC) 350, so there was a place to store this stuff.
就在两年前，IBM还开发了第一个随机访问磁盘存储设备，Random Access Memory for Accounting and Control (RAMAC) 350，所以有了存放这些东西的地方。
MMU Memory Management Unit, translates virtual to physical addresses and provides access permission control.
内存管理单位，把虚地址转化为物理地址并且提供访问许可控制。
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