error on disk space

[Kam65]

 I have had the laptop now for a few years, the computer crashed and had to be rebooted,  Has a 1 terabyte of disk space but for some mad reason  windows C drive and HP support assistance "My computer" shows it has only 120gb on disc space

Can anyone help on how to solve this issue. this has only happened after the computer crashed and had to be rebooted.

[WAWood]

@Kam65 

You're confusing the issue by using the wrong terms.  No PC has 1TB of "memory"; instead, what is has is 1TB of "disk space".  These are entirely different things and mixing the terms makes solutions impossible.

If you have a 1TB drive, that will not change, no matter what you do.  But some of that drive is used; some is free space, and some is unallocated.  You need to tell us more details about the 120GB figure you are quoting.  If this is the free space on the drive, I can provide you links to utilities you can run to free up more space.

[Kam65]

Sorry for my error, it must be disk space as you suggested .

under the HP customer assistance system information the HDD drive C says 120 gb . If this helps product number is FSC76EA ABU . 

Sorry again for confusing things. I have correct my original post to reflect 

[WAWood]

@Kam65 

Having no idea how your 1TB drive is formatted, I also have no idea of how much free space you should have in the OS partition on the drive -- but 120GB seems low.  Windows Update runs every week automatically and when it does, it adds files to your drive and does not clean up after itself.  So a lot of the used space could be due to that alone.

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

Finally, there is a freeware app known as Wise Disk Cleaner. I use it every day to get rid of junk files: https://www.wisecleaner.com/wise-disk-cleaner.html

[Kam65]

not sure if this helps but on 'this pc ' it says windows c 10gb of 119gb. I f there is away of finding out how it formatted so i can give give more info then ley me know.. it s a windows 8.1 

[WAWood]

@Kam65 

Just run the utilities to free up disk space and see how that goes.

[Kam65]

just checked on Disc management and it says there is 120 NTFS but there is 791.98 gb ' unallocated ' which would be the missing gb, Is there away of adding his 'Unallocated back to c drive '

[WAWood · Accepted solution]

@Kam65 

I no longer have any Windows 8x PCs in service -- so I have to do this from memory.

Open Disk Management and that will list all the "drives" (which is what MS calls them, but everyone else calls them Partitions) that are on the disks.  You should have one disk (Disk 0) and 2-4 Volumes.  These often are the following: System Reserved, Recovery, OS, HP_TOOLS -- but this can vary from PC to PC.

You need to provide us this information from your PC, we need to know the following for each volume: Name, File System, Capacity, Free Space.