Couldn’t unmount disk error message generally occurs on Mac devices when trying to repair, format, partition, or modify the boot drive/internal disk using Disk Utility. Undoubtedly, it’s the most annoying issue encountered by Mac users. But fortunately, there are some ways available in this post that can help you fix “Couldn’t Unmount Disk” error.
Taposhi is an expert technical writer with 5+ years of experience. Her in-depth knowledge about data recovery and fascination to explore new DIY tools & technologies have helped many. She has a great interest in photography and loves to share photography tips and tricks with others.