Defragmenting Hard Disk in windows 10:
Fragmentation occurs because when you save files on your hard disk, Windows 10 will try to save the file in the first accessible space. Should this space not be big enough for the file, it will save some of the file there, and place the rest of the file in the next available space . If that space isn’t large enough for the remainder of the file, it will be split again. This isn’t a problem for new installations of Windows and your apps, or for copying or downloading your files to a clean hard disk for the first time, but as a hard disk gets used more and more, and files are changed and deleted, the number of large blocks of free space reduces and file fragmentation begins to occur.
SSDs and Drives don’t suffer from this, the reason being that solid-state disks are a random-access memory storage medium, and therefore pulling a file from multiple locations doesn’t slow them down. What slows down mechanical hard disks is the movement of the read arm across the spinning disk platters.
Having fragmented disks on a PC can really slow down the operation of the PC, from Start-up to file access, if mechanical disks are used. Windows 10 includes an automatic maintenance system, detailed, that will automatically defragment drives. What can happen, however, is that defragmentation set to occur when the PC is in use can also slow it down, and if the defragmentation is set to occur when the PC is likely to be switched off, it won’t happen at all.
Change Settings in Defragmentation in Windows 10:
Step 1: You can change the settings for defragmentation in Windows 10 by searching for defrag in the Start Menu or Cortana and clicking Defragment and Optimize Drives . The main Defragmenter window lists all of the hard disks and partitions on your PC, along with their fragmentation status,
Step 2: Clicking the Change settings button will allow you to choose which drives will be automatically defragmented by Windows 10, and how often this occurs. You can choose to exclude any solid-state drives should Windows 10 have not already excluded them from defragmentation.