Wanting to use unallocated space on my hard drive, any dos and don'ts?

My C: partition gets low on free space. It's mostly filled with files that make up the games I play when looking on Windirstat. However, when I looked on disk management, I noticed that there's 99.9 GB of unallocated space on my hard drive plus a few smaller partitions. I knew 830 GB (the size of my C: partition) was a bit lacking considering I have a 1 TB hard drive but I didn't think about unused hard drive space until now. Here's a screenshot:

I think I should use up this unallocated space for my C: partition and I don't know if any of these smaller partitions are necessary to keep. I also don't want to erase anything on my hard drive by accident, but I have some experience with expanding and reducing partition space for adding new partitions on disk management. Are there any things to recommend on what I should and shouldn't do?

Thats fairly simple you move c to the left so the free space is then after c once done you can then grow c I wouldnt both about the other small one leave them use Best Free Partition Manager for Windows | MiniTool Partition Free it makes the job simple

Samuria said:

Thats fairly simple you move c to the left so the free space is then after c once done you can then grow c I wouldnt both about the other small one leave them use Best Free Partition Manager for Windows | MiniTool Partition Free it makes the job simple

How can I move C: to the left?

topgundcp said:

You can delete either 1 or 3 depending on where your recovery is currently used by Windows.
Delete 2 (D: drive) : only 99MB
To find out which Recovery partition is used: run from Admin command: reagentc /infothen merge 5,2, 1 or 3 into C.
Final should look: Recovery, EFI System,MSR (hidden from DM) , C drive
NOTE: there's also a 16MB MSR partition which DM does not show

It says partition 1, so I should delete 3 as well, yet right clicking only gives me a help option. Also, how do I merge them?

Well, I installed Partition Magic and used it to have C: use up the unallocated space. However, I ran into a wall when trying to merge the smaller partitions into C: as one of them are in the FAT32 file system. The problem is that I can't convert the FAT32 partition into an NTFS partition as it doesn't give me option for that, yet, it does give me the option to convert all the other partitions to convert from NTFS into FAT which I don't want to.

just delete the partition, it will become unallocated space then you can expand into it.

Partition Wizard is an excellent tool. I expect you have sorted out those recovery partitions. Note you can use Partition Wizard to peruse the contents of those hidden recovery partitions to work out which is the oldest for deletion. Also ensure you have a full system image backup before you start fiddling with system partitions.

topgundcp said:

WARNING: Always create a backup image of current Windows disk before any modification in case something goes wrong then you can roll back.

Do you mean a system restore point? I don't know if I can backup 766 GB of data somewhere.