Computer Science - Operating Systems Concepts - Discussion

External fragmentation means: suppose you have memory block available of 100mb and you have 3 tasks of say 1st 5mb, 2nd 4mb and 3rd 10mb. But remember although you have 100mb but you can give that memory block to any one of them.

So simple you have to broke that memory block means to make a segment of say 20mb segment size.

So remember now you have 5 segments of 20mb n you can store 5 different data of size up to 20 MB.

A partition of main memory is wasted within a partition is said to be INTERNAL FRAGMENTATION.

And the wastage of an entire partition is said to be EXTERNAL FRAGMENTATION.

Yes, Paging and Segmentation are used to avoid fragmentation.

Then how come the answer is A. Can anyone explain it?

Segmentation suffers from external fragmentation and paging suffres from internal fragmentation.

But "paging avoids external fragmentation and the need of compaction" ----- SilberSchatz book.

External fragmentation memory is separated into small blocks and we also called segmentation.

Paging and Segmentation avoids fragmentation. So why answer is A?

What is External Fragmentation & Internal fragmentation?