A group
MEMORY MANAGEMENT
- Why we need a protection mechanism executing in run time?
since the programs can be relocated, to know addresses in advance is impossible.

VIRTUAL MEMORY
- what is the most important advantage of using SSD?
Time elapsed for swappings implemented when page faults are occurred decreases.

FILE SYSTEM
- Why does a mass storage need low level format?
To store data, mass storage devices should be divided into some logical units and a special data structure in each unit. Otherwise, computing physical position of any data in the device cannot be possible.


B group
MEMORY MANAGEMENT
- What are two important problems in fixed partitioning?
Internal and External fragmentation

VIRTUAL MEMORY
- How is the system performance increased by using dirty bit?
When a page fault occurred, the system with dirty bit does not have to use "swap out" to empty a memory page.

FILE SYSTEM
- As mass storage, what is the most important advantage of using SSD?
Because of no moving parts, there is no seek time or rotational latency.