OEM Partition, also known as System Reserved Partition, is placed by the OEM to help users recover their computers or bring back the original state of the computer when it was bought. If you’ve observed that a part of your hard drive says “Healthy (OEM partition)” in the Disk Management and it occupies space in GBs, then this means that it’s normal and there’s nothing to worry about except that part of the storage space is not available and even when you right-click on it, the only thing it displays is the Help menu. Thus, in this guide, you will be guided on how you can merge as well as delete an OEM partition in your Windows 10 computer.
Since the Disk Management tool in Windows won’t let you merge or delete the OEM partition, you can just use the built-in command-line tool known as Diskpart. Note that you have to be extra careful when you run the commands as it could mess your computer up and before you proceed with the instructions provided below, make sure that you create a System Restore point first. Once you have that covered, follow the instructions below.
Step 1: Tap the Win + R keys to open the Run dialog box and type “cmd” in the field and tap Enter to open the Command Prompt.
Step 2: Next, execute this command to launch the Diskpart tool: diskpart
Step 3: Execute this second command to view the list of the disks in your computer: list disk
Step 4: Now select the disk you want to manage by executing this command: select disk x
Note: In the command above, replace “x” with the letter of your disk.
Step 5: After that, execute this command to display all the volumes or partitions: list partition
Step 6: Now execute this command to select the partition you want to delete: select partition x
Note: You have to replace “x” with the partition you want to delete.
Step 7: Once done, execute this command to delete the selected partition: delete partition override
Step 8: Afterwards, execute this command to merge the OEM partition with the adjoining value: Extend
Note: if you only want to merge part of the partition, you need to use this command “extend [size=<size>]”. For instance, you want to extend its size by 5GB, then you need to type “Extend size=5000”. The size you set is the size you select from the OEM partition. This will extend the selected volume by size in MB or megabytes.