You will have to kill and rebuild the MBR (master boot record) this varies on what OS you are using.
The only problem is you will lose everthing on the drive so back up what you want to keep first, which you cant.
Surface Pro 5 News - release date, UK price, features, specs
Microsoft Surface Studio hands-on review: the iMac killer is here
Best Mac antivirus 2017
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.