I couldn’t create a bootable USB disk to deploy an OS for some reason. As usual Microsoft error is useless, it doesn’t actually tells nothing about the actual issue.
All I get was “Failed to create media” and reading logs doesn’t lead to anywhere.
Strangely these two things worked the magic.
1. Disabled Antivirus (frigging Symantec Endpoint Protection, I hate this stuff)
2. Disconnected all network drive mappings (run Net Use * /delete /y in command prompt)