You likely have been creating a recovery partition every time you installed 10. If you want to clear them all, backup your files, delete all partitions off the drive, create a new one, install Windows on that. Yes, it was pre-built with Windows 8, in which I upgraded to 8.1, and then multiple builds of Windows 10.

Why do I have many partitions?

If you have multiple partitions, multiple different drives would appear when you plugged your USB drive into your computer. … For example, many Windows computers come with a separate recovery partition where the files you need to restore your Windows operating system to its factory default settings are stored.

How do I reduce the number of partitions in Windows 10?

Begin -> Right click Computer -> Manage. Locate Disk Management under Store on the left, and click to select Disk Management. Right click the partition you want to cut, and choose Shrink Volume. Tune a size on the right of Enter the amount of space to shrink.