External hard drive not mounting Mac
After upgrading from OS X Sierra to OS X High Sierra on my MacBook Air, I can no longer mount and read my external hard drive. During the upgrade, I converted my MacBook hard drive to APFS. My external drive is formatted as Mac OS Extended.
Is the data on my external drive inaccessible now that I have APFS on my computer? Or is there a way to access it?
[Re-Titled by Host]
MacBook Air (13-inch Mid 2013), macOS High Sierra (10.13)