Right-click the system disk C and select "Properties". Sure enough, the remaining space is less than tens of MB. However, if you select all files under drive C, the size is only 4GB, and there is still room for 1GB. Stranger still, when my Windows system was installed, it was only about 1.7GB, but now it is a 2.65GB behemoth.
Mystery of space loss
Click Start → Control Panel → Folder Options → View, remove the option of "Hide Protected Operating System Files (Recommended)" in the advanced settings area, and select "Show All Files and Folders" in the option of "Hide and Folders". At this time, there are two more files hiberfil.sys and pagefile.sys and a system volume information folder in drive C, each of which is almost 300MB. I see. It's these things that are at work.
solution
Open Control Panel → Power Options → Hibernation and delete the "Enable Hibernation" option. At this time, I went to drive C to check the hiberfil.sys file, which had left without saying goodbye.
Select Control Panel → System → Advanced and click the "Settings" button in the performance area; Then select Advanced → Change, select the partition where the system is located in the virtual memory window, and select No Paging File → Settings to clear the paging file of the system partition; Finally, choose another partition (with more space). If you want to set the page file size manually, select Custom Size; If you want the system to manage itself, select System Managed Partitions. At this point, the pagefile.sys file under drive C has been transferred to the partition you selected.
The system volume information folder is used to store system restore files. For it, you can turn it off by selecting "Start → Control Panel → System → System Restore". If you don't want to turn off system restore, you can double-click my computer, right-click the system partition letter, select Properties → General → Clean Disk → Other options, and click the Clean button in the system restore area. At this time, you can find that the folder has changed from 300MB to 30MB.
WinXP obesity mystery
After a period of use, more folders starting with $ TERM uninstall will appear in the system to uninstall the backup of upgrade files. Especially after upgrading SP2, the SoftwareDistribution\download folder and NtServicePackUninstall folder have occupied about 800MB of space.
Slimming method:
Delete all files in the software distribution \ download directory; Delete $NtServicePackUninstall$ and all folders starting with $NtUninstall. After performing the above steps, you will not be able to uninstall the previous upgrade patch in Add or Remove Programs.
If it helps you, please remember to adopt it as a satisfactory answer, thank you! Wish you a happy life!