What is the reason for the large change in the remaining space of the C disk? 50

This is caused by a change in virtual memory.

When the system is running, the required instructions and data must be transferred from external memory (such as hard disks, floppy disks, optical disks, etc.) into memory, and then the CPU reads instructions or data from the memory for calculation, and stores the results in memory, which plays the role of a "setter". When running a program requires a lot of data and occupies a lot of memory, the memory repository will be "stuffed", and there is always a part of the temporarily unused data in this "warehouse" that occupies a limited space, so this part of the "lazy" data should be "invited" out to make room for the "active" data to use. In this case, you need to create another back-up "warehouse" to store the "lazy" data.

Due to the large space of the hard disk, the Microsoft Windows operating system selects the address of the backup "warehouse" on the hard disk, and this backup "warehouse" is the virtual memory. By default, virtual memory is saved in the system partition of the hard disk as a swap file called it.

You right-click on My Computer Properties Advanced, then click Settings in the "Performance" box, then select the "Advanced" tab, click "Change" in the "Virtual Memory" box, change the drive from C to D or E partition, and your C drive will be stable.

This may be due to virtual memory, which may make the available space smaller because it takes up space on your hard disk. If there may be a problem with a virus, it is recommended to use an up-to-date antivirus software to disinfect in safe mode.

By the way, enter safe mode to see if this happens, if it happens, it is estimated that it is not the cause of the virus.

Press F8 to enter safe mode when powered on.

It may be a virus, it is recommended to try it with an antivirus, if it doesn't work, it may also be a system restore, it is recommended to use a system tool to clean up the hard drive, and then double the system when the computer is in the best condition, and then pass"My computer"System Restore option in the context menu Turn off System Restore in case of problems Right-click on my computer Properties Advanced and then click on the settings in the "Performance" box Then select the "Advanced" tab Click "Change" in the "Virtual Memory" box to change the drive from C to D or E If you don't like it, upgrade the memory module.

It's the reason for the cache, this is normal, don't worry, you can use Windows Optimizer, scan junk files, delete it! ~

Could it be caused by the system's restore function being turned on, you can try to turn off the system restore.

Clean up junk files with Optimizer. To see if you unconsciously put a movie or something like that on the C drive, you forgot.

You can do a disk cleanup and take a look.

This is because of the problem of checking the option when installing the software, and now the software is generally installed for the user to check, and the document storage also allows the user to check it.

Therefore, in this case, the installation software should be checked on the C drive, and the files generated by the storage software are on the D drive.

And because only the files that are "needed for the operation" of the software are placed on other disks, the files that are "generated" by the software are still placed in the C drive.

The simplest example is to install QQ on the D drive, but QQ will put the chat history and other cache files in the documents folder of the C drive by default.

The importance of the C drive:

The C disk of the computer is the main drive letter of the program, and other disks other than the C disk can be used as software installation disks or file storage disks. C disk is generally the default system disk, the computer's operating system is generally installed on this disk by default, this disk must be the main partition.

Drive D, generally for ease of management, is divided by removing the space of disk C, according to the size of the total amount of hard disk space, the size of each partition is divided, theoretically it can be divided into N, in literal order to the bottom of the row.

In general, the C drive is mainly the storage space for the system to run, if the C drive is full of things, it means that the storage space of the computer is small, and the operation will be slow. In addition, the things on the desktop are also in the C drive, so don't put too many things on the desktop. In addition to some necessary software at the time of installation, it is recommended to put the software and various files installed in the later stage, and it is better to put them in the D, E, and F disks other than the C drive.