Chapter 4: Security Architecture and Design - Operating System Components Part 2

The memory manager is the part of the OS that keeps track of how memory is allocated and used. Below is a summary its five responsibilities.

1) Relocation - contents of RAM go to the HD and give pointers to apps when needed.

2) Protection - Allows process to interact only with memory assigned to it and gives access control to memory.

3) Sharing - Implements controls when various processes have to access the same memory segments and allows different application users access when the app is running in one segment of memory.

4) Logical Organization - Segment memory types abstractly and allows sharing between software mods.

5) Physical Organization - Segment physical space for applications or OS processes.

I seem to always get the two of these mixed up. Here is a reminder:
RAM - place where data can be temporarily held.
ROM - Nonvolatile.  Data is still help in chips when the computer is turned off.