Laptop disk cleaning effect is big

What is the use of laptop disk cleaning? Laptop disk cleaning can defragment disk, compress old files, etc. to save disk space. Laptop disk cleaning method, right click on your disk, select properties, as shown in the disk cleanup, follow the system prompts to proceed. It usually takes a long time to complete. Note: What is disk fragmentation? In the logical volume of Windows, files are not always stored in a contiguous cluster of disks, but are scattered and stored in different locations. When the application requires insufficient physical memory, Windows will generate a swap file (usually: pagefile.sys) on the disk, and virtualize the disk space occupied by the file into memory, namely: virtual memory. Due to the need for frequent data exchange between physical memory and virtual memory, the Windows virtual memory manager frequently reads and writes hard disks, resulting in a large amount of fragmentation, which is the main cause of disk fragmentation. In addition, another major cause of disk fragmentation is temporary files that are frequently generated by the system or application. For example, when browsing a web page, the browser generates a large amount of disk fragments due to continuous cache. In addition, when installing or downloading new software, the system typically stores the file on the first contiguous free space that is large enough for the file. If there is not enough free space, Windows will save as many files as possible on the largest available space, then save the remaining data on the next available space, and so on.