Defragment

To understand defragmentation better, it helps that you first know something about fragmentation in a computer’s file system. Data is stored in a computer’s hard disk. When you store data, it normally occupies the hard disk in a contiguous manner when there is sufficient space on the disk. Over time, when data files get deleted, there will be gaps in the data space left on the disk. When new data files need to be stored, the operating system will try and allocate enough contiguous space to store a complete file as a unit. If it cannot do so, perhaps because the data files are too large and cannot be fitted into a single gap available, Windows will put parts of these files in gaps between other files. The result is that these data files will become segmented and fitted across several gaps in a non-contiguous fashion, causing disk fragmentation. Progressively with use, the hard disk will become more and more fragmented after excessive writing, deletion of data as well as storing of new data. With fragmentation, there is delay in accessing a file, because when a read request is executed, the disk will have to search for the multiple pieces, process them and concatenate these pieces before they can appear on your computer screen. That degrades the performance of your system. Defragmentation is a process that tries to reduce the amount of fragmentation in the file system. This process does this by physically organizing the contents of the hard disk in such a way as to store the pieces of each file close together in a contiguous way. The process will attempt to create larger regions of free space (so disks won't get fragmented again so quickly) and perhaps also try and keep files within the same directory together. With a defragmented disk, the disk access time will be improved, and one can get faster response time from the computer when one next reads a file or execute an application that requires data from the disks.

Defragmenting means rearranging your files so that they are contiguous to each other thus increases the speed of your pc when a program needs that certain file...

It rearranges all the related files in such a manner that they can be accessed easily and quickly. This enhances your system performance. Take care.

files are not always one piece on computer . they are in pieces. defragmenting brings all isolated pieces of a file together at one place. it results in opening, reading the file quicker

defragmentation is a process that reduces the amount of fragmentation in file systems.it means to move all files together and try to remove small amount of place between files.So at the end of defragmentation all the files will be on oneside leaving the unused space behind.