external hard drive for macbook pro not mounting 2018

Why exactly did this happen on a disk that was working perfectly fine the day before? Was the disk affected by something in the macOS Big Sur beta or is it a completely unrelated issue? I was searching for solutions for this issue and found that it was somewhat common, and that people recommend using DiskWarrior to repair the disk, however, I cannot justify spending $100 to repair a disk when I might as well just buy a newer and faster SSD. So it was obviously not the beta, it was the disk. However, I soon came to find out it was also happening on another MacBook Air that has macOS Catalina 10.14.2 installed. I automatically assumed that this was just a bug in the new beta update and I reported it to Apple. I tried to click Mount, which was not greyed out, and I received an error that the disk could not be mounted:Ĭould not mount “TOSHIBA EXT”. I opened Disk Utility to find that the disk was displayed as not mounted. Just about a half a week ago, after using the drive completely fine in macOS Big Sur, I plugged in my external hard drive and found that it did not appear on my desktop or in Finder. I backed my MacBook up onto my external hard drive before installing macOS 11 Big Sur beta, expecting to be able to use it just in case I need to go back to macOS Catalina. I decided to update my MacBook to macOS Big Sur developer beta (because I am a dev) and test it out.

All of my MacBook Pro 13' 2017 backups are kept on my Toshiba External HDD.

External hard drive for macbook pro not mounting 2018