Friday, April 10

Disk defragmentation (Defrag)

About 5 hrs remaining, yes I am at present performing a Disk defragmentation of my PC. And
this is the reason why I am writing this post.

What is Disk Defragmentetion?
Hard disk store data in chunks called sectors. Initially when OS is installed freshly, the files are stored in a systematic order, in an organized manner.

When you add a file, the OS places it anywhere it finds sufficient space to place that file. The OS could have placed it contiguously, but it didn't.

Fragmentation :
In a hard disk , when files, folders are created, copied, pasted to some other location,deleted from hard drive, they tend to get over time, they end up in pieces spread all over the hard drive.

One part of file is placed in some location , and the other part is placed on other location. The part of the file is linked to the other part. Thus the OS knows how to locate the files and access them.

When looking for this fragmented files, the read/ write head of the hard disk has to do a lot of moving around. These may cause system slowing down, during boot time, and also slow down the transfer rate.

Defragmentation :
The idea behind defragmentation is that , all the similar files are to placed in a sequential order. The Program disk defragmeter in Microsoft windows, helps to get all the similar files in a sequential order placing them in sectors close to each other.

In addition, a good defragmenter may also try to optimize things even more, for example by placing all applications "close" to the operating system on the disk to minimize movement when an application loads.

When done well on older disks, defragmenting can significantly increase the speed of file loading.

On a new disk that has never filled up or had any significant number of file deletions, it will have almost no effect because everything is stored sequentially already.

As you might imagine, the process of individually picking up and moving thousands of files on a relatively slow hard disk is not a quick process -- it normally takes hours.

P.S : For the defragmenter to properly run, ensure you have no applications running. Typically, SYSTRAY and EXPLORER are all you need to have running to run this application.

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