I have just returned from a family trip and was talking to my brothers about our recent experiences upgrading to Windows 10.
Drive Space is Precious
Two of us had unwanted recovery partitions. The normal method of using Disk Management did not allow deleting the recovery partition.
You may not need your old recovery partition if you are happy with Windows 10 and will not return to Windows 7 or 8.
The first Google search for solving the problem recommends buying a program called EaseUS partition manager. I have found that purchasing that program is unnecessary. Windows contains a built in console program named DISKPART.EXE.
Before running these steps, run Create a recovery drive from the Windows search. It may contain an option to remove the recovery partition after creating a USB recovery drive.
Creating a recovery drive did not allow me to remove my recovery partitions. These are the steps I took to manually remove it.
Search for PowerShell in a Windows search. Right mouse click on PowerShell and choose the Run as Administrator option. This will allow modification of your protected hard drive partitions.
Be warned, yes these are potentially very dangerous commands that will break your computer if done improperly! Make sure you have a full backup and a Windows reinstall method (USB, CD). Proceed at your own risk.
PowerShell running as administrator should look like this:
Type DiskPart and enter.
This indicates that we are now running disk part and can type commands specific to the program. Typing a question mark will display the available commands.
We will now run List Disk.
This displays the disk attached to the system. I have one solid state drive and two hard drives. This shows the disk numbers which are needed for the next step.
Run Select Disk 0
Run List Partition
Select your recovery partition. In my case it is partition number 2, but it could be any number.
Run Select Partition 2 and then run Delete Partition Override.
You have now successfully removed your unwanted recovery partition. You can now extend your windows partition using Computer Management.
The comments suggested a good tool to increase disk space is the built in Disk Cleanup utility. See this page for details
In my case I had a 128 GB tablet with 17 GB recovery drive. My brother had a 32 GB netbook with a 4 GB recovery drive. Freeing up over 10% disk space can really improve the usefullness of your computer!