What effect does "defragmentation" have on a disk?

• A. It increases disk storage capacity
• B. It reorganizes fragmented data for efficiency
• C. It converts the file system format
• D. It adds security to the data

Answer: (B)

Defragmentation is a process that improves the efficiency of data retrieval on a disk. Over time, as files are created, modified, and deleted, data can become fragmented, meaning that pieces of the same file may be stored in non-contiguous sections of the disk. This fragmentation can slow down access times because the read/write heads of the disk have to move around to gather all the fragments of a file.

When defragmentation occurs, the fragmented pieces of files are reorganized into contiguous blocks. This means that when a file is accessed, the read/write head can read it more quickly because all the data is located in one place rather than scattered across the disk. This reorganization leads to improved performance and efficiency of the disk in data retrieval.

The other options do not accurately reflect the function of defragmentation. For instance, defragmentation does not increase disk storage capacity, change the file system format, or directly add security to the data. Its primary purpose is to enhance the speed and efficiency of data access by minimizing fragmentation.