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Defragment - what is it?

  • Oct 30, 2025
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If your Computer is slower and slower with time, it can help to defragment the hard disk. But what is it actually? We tell you in our practice tip.

Defragment hard drive clean up

  • Your Computer files in the Form of equal-sized data blocks (fragments) stored in the hard disk.
  • Large files such as Videos consist of many, smaller, less blocks.
  • Your hard drive arranges these blocks in the reading direction, that is - figuratively speaking - from the left to the right.
  • When you delete a file, occur between occupied blocks, gaps can be re-occupied.
  • You can now save a file that is greater than the first "gap", distributed in your PC the file to several free, non-contiguous blocks. One speaks of fragmentation.
  • Similar happens when you edit a document, for example, a text file, after a while, once again, The file will be larger and your PC stores the additional data in the next free blocks.
  • The fragmentation affected the read speed of your hard drive, because your PC has to search for fragmented files "together".
  • When defragmenting, the individual blocks are reordered, logically related blocks are arranged one behind the other.
Fragmentation of a hard drive

Disk defragment in Windows 7 and 8

If your PC takes a long time to open files and programs, it can help to Defragment the hard disk.
  1. Start Explorer (my computer) and navigate to "This PC" or "Computer".
  2. Click with the right mouse button on the hard drive you want to defragment and select "properties".
  3. Under the tab "Tools" click "defragment Now" (Windows 7) or Optimize (Windows 8).
  4. In Windows 7, click on "disk Defragment", in the case of Windows 8, the process is called "Optimizing".
Defragment on Windows 7
Please note that the Defragment the hard disk drives is mainly that of a normal HDD, which is very useful. If and when a defragmentation for SSD's is necessary to read in the next tip.

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