I have a Lenovo laptop that has dual-boot Windows 7 and Windows 8. Read about upgrading Windows 8.1 to Windows 10 in this page, video included.And sometimes, because I am using Windows 8 more than Win 7, when I use Windows 7, the safely remove option is missing.
So I thought, if you are in the same situation like me, you could try this first, or read the manual from Microsoft.
In Windows 7, we can choose the “eject” device, for example an USB device.