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Besides causing slowdowns, fragmentation makes the disk drive heads move too much when reading files which leads to freeze-ups and system crashes.

Therefore fragmented disks often become a bottleneck of the system performance. Hard disks are by far the slowest component in your computer. After a large portion of a disk has been used, most of the subsequent files and folders are saved in pieces across the volume. Computers do not necessarily save an entire file or folder in a single space on a disk they're saved in the first available space. Fragmentation is caused by creating and deleting files and folders, installing new software, and downloading files from the Internet.