how can I clean up my disk space (recovery D)

[mymodded]

so today , my laptop's disk space became very low (around 800mb free of 20.6gb), although it was working fine yesterday. so my laptop was so laggy so i had to hold the power button (to force shutdown it), and after I had forced shutdown it , i opened it then i tried to open a game, but it crashed , i tried again , it crashed then i opened the file explorer and realised that the recovery D had low space. is there a way to clean up the disk?

[wb2001]

@mymodded,

Your unit is the HP 15 r225ne, shown here.

The computer has a 2.5" 500GB hard drive. It has several partitions (separate areas) on the hard drive called "partitions". The Recovery D is not used for your personal files. It is created with limited free space. Leave it alone.

The C partition is comprised of the Windows  Operating system, and all of the following: 

User files, programs that YOU installed, and data files ( pictures, documents, movies, and more).

[Paul_Tikkanen]

Hi, @mymodded 

See if this link from HP is of help to you...

[WAWood]

@mymodded 

The problems you're reporting have nothing whatsoever to do with the lack of free space in the Recovery partition.  As already mentioned by @wb2001 that space is NOT used for your personal files, so even it it was full, that would not affect your gaming of other functions.

Additionally, the specs for you model show it came with a 500GB HDD, which I find very hard to believe is full to the point of having only 20+ GB  free -- but here are some things you can do to recover some of the disk space:
http://www.tenforums.com/tutorials/3012-disk-cleanup-open-use-windows-10-a.html
http://winaero.com/blog/how-to-clean-up-winsxs-folder-in-windows-10/

Also, the community Win10 Forums has the following suggestions:
https://www.tenforums.com/tutorials/83441-free-up-drive-space-windows-10-a.html

In addition, I have found the utility Cleanmgr+ to have LOTS of options for removing Windows junk, including log files. I use it practically every day. You can get it from here:
https://www.mirinsoft.com/cleanmgrplus

IF you use all those and free up considerable space and you STILL have problems, it has nothing to do with the lack of disk space.