Gone partition. will a clean os install help?

[Loksan3]

I have a brand new MacBook pro 15 2018 500gb and when I tried to install Windows 10 using bootcamp (I need it for work) an error message showed up and now the 120gb for windows are gone for the main partition. Bootcamp cannot merge the partitions back and I've tried everything including terminal commands from the internet,disk utility reformatting and nothing seems to help.

Now my brand new MBP has 123gb less storage. Will a clean install of Mac OS fix this? I am a first time mac user by the way .

 

[Weaselboy]

Now my brand new MBP has 123gb less storage. Will a clean install of Mac OS fix this? I am a first time mac user by the way .

A clean install alone will not fix this. You first need to reformat the whole drive back to one volume.

So command-option-r boot to Internet recovery, then once in the recovery screen open Disk Utility and set it to show all devices like in my screenshot. Then select the Apple SSD at the very top then click the erase button and format to APFS. That will get the drive back to one partition.

Then quit Disk Utility and reinstall the OS.

This all will of course wipe all your data, so backup first.