If access to the hard disk slows down, this could be due to fragmentation. This is a common cause, at least with older storage media, which is why Windows includes its own program for defragmenting hard disks. External tools, that once were very popular, are no longer necessary for Windows 10 users. The included defragmentation tool is easy to find and access via the context menus in File Explorer. Here, we’ll show you how to defragment your disks in Windows 10.
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Highly secureShared accessAvailable anywhereThe effective speed of a hard disk depends not only on the revolutions per minute (RPM) or data throughput rate in KB/s (kilobytes per second), but essentially on how the files are arranged on the hard disk. Ideally, all files are located one after the other, each as a closed block on the hard disk. When reading the data, the read head of the hard disk therefore only has to pass over the data block once in order to read the complete file. In practice, however, this ideal state exists only shortly after a new hard disk has been formatted in Windows i.e. on the operating system used.
When deleting files, gaps appear on the hard disk, which later have to be filled by other data fragments. That’s how, over time, many files are distributed in several single fragments on the hard disk. Access to the files remains seamless, but will take longer than usual. When defragmenting, all fragments of a file are searched for and saved as a coherent block. In doing so, the contents of the individual sectors must be physically read.
In most cases the feature to automatically defragment in Windows 10 is sufficient. However, if you want to manually defragment your hard disk, you can follow these steps:
Step 1: Right-click the drive you want to defragment in Explorer and select ‘Properties’ from the context menu.
Step 2: Next, click on ‘Optimise’ within the ‘Tools’ tab of your disk.
Step 3: Select the desired drive and start the defragmentation process by clicking on ‘Optimise’. Hard disks with a fragmentation of 10 percent or less don’t have to be defragmented.
You can also launch defragmentation in Windows 10 by opening the Start menu and selecting ‘Defragment and optimise drives’ from ‘Windows management programs’.
For more tips on how to speed up Windows 10, read our article ‘Speed up Windows 10: 8 tips for better performance’.
How long a defragmentation takes mainly depends on the size and fill level of the hard disk. With automatic defragmentation, there is no loss of time. A complete defragmentation process can take several hours for large and very full hard disks. The file allocation table which holds the information on how individual files are addressed and the directories must be written back to the hard disk immediately after each change, which slows down the process considerably. A prerequisite for successful defragmentation is also that there is enough free space on the hard disk to temporarily store the data that is being moved.
Modern data systems no longer require manual defragmentation. Automatic defragmentation that works in the background is far more efficient.
SSD data carriers should not be defragmented anymore. In this case, defragmenting the drive can do more harm than good.
Windows schedules automatic defragmentation of all hard disks by default. Hard disks with automatic optimisation are almost always displayed with a fragmentation of 0 percent.
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