What is Disc Defragmentation?

Disc Defragmentation.

Disc defragmentation speeds up your computers performance by rearranging data on drive. But before this we should know why data is fragmented? To know the answer of this we should know, how the data is written to disc?

Inner view of a hard disk drive Seagate Medalist ST33232A

A mechanical drive has platters and head that reads/writes data. The magnetic surface of each platter is divided into small sub-micrometer-sized magnetic regions, each of which is used to represent a single binary unit of information. In Hard discs you have seen, it was written 7200 RPM, 5400 RPM. Means the platters rotates 7200 rotations per minute. We saved a file now it saved it somewhere in the disc. After some time with some changes we saved the same file again on same disc. Now the changed portions of file will be saved at somewhere else, where space is available. Computer maintains a record of this in file allocation table. The process of storing differs from one file system to other. The area of density of a modern hard drive is 600 Gbits/ In2.

Fragmentation is the process or state of breaking or being broken into fragments. In computing term fragmentation is the storing of a file in several separate areas of memory scattered throughout a hard disk.

Fragmentation makes your hard disk do extra work that can slow down your computer. Disk Defragmenter in Windows rearranges fragmented data so your disks and drives can work more efficiently. Disk Defragmenter runs on a schedule, but you can also analyze and defragment your disks and drives manually. To do this, follow these steps:

To defragment your hard disk

    1. Open Disk Defragmenter by clicking the Start button. In the search box, type Disk Defragmenter, and then, in the list of results, click Disk Defragmenter.
    2. Under Current status, select the disk you want to defragment.
    3. To determine if the disk needs to be defragmented or not, click Analyze disk. If you’re prompted for an administrator password or confirmation, type the password or provide confirmation.Once Windows is finished analyzing the disk, you can check the percentage of fragmentation on the disk in the Last Run column. If the number is above 10%, you should defragment the disk.
    4. Click Defragment disk. If you’re prompted for an administrator password or confirmation, type the password or provide confirmation.

Disk Defragmenter might take from several minutes to a few hours to finish, depending on the size and degree of fragmentation of your hard disk. You can still use your computer during the defragmentation process.

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