In many cases, the only way you could try to solve this problem is to completely remove the external drives and then restart your MacBook or Mac several times until the drives finally show up again. It won’t mount at all and acts as if it’s utterly invisible to macOS.
When you try to plug in the drive again, your Mac no longer sees it. This often occurs after you initially eject the external drive and unplug it from your computer. Sometimes MacBooks, MacBook Pros, or Macs don’t recognize external drives or external thumb drives. What’s wrong? How can I fix external hard drive not showing up on Mac issue?” “Why can’t my Mac show up the external hard drive? I have tried to connect and disconnect the external hard drive to my MacBook for times, but still the external hard drive doesn’t show up on Mac.
