FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -Defragmentation reverses the process your computer uses to break up data when it saves files to your hard drive. Defragging reformats your drive, reconstituting the files that were fragmented when they were written (saved) to your disk.

Detailed explanation-2: -Disks become fragmented over a period of time after continuous usage. Disk defragmentation helps rearrange the files on the disk to contiguous spaces and thus improve disk performance.

Detailed explanation-3: -In the maintenance of file systems, defragmentation is a process that reduces the degree of fragmentation. It does this by physically organizing the contents of the mass storage device used to store files into the smallest number of contiguous regions (fragments, extents).

Detailed explanation-4: -There are three different but related forms of fragmentation: external fragmentation, internal fragmentation, and data fragmentation, which can be present in isolation or conjunction.