Thanks everyone. @YvesZ I'm still running into a snag. M1 Pro Macbook Pro Sandisk Extreme PRO 4tb Drive plug in - "The disk you attached was not readable by this computer." Upon attempting to mount in disk utility - "Could not mount “disk4s1”. (com.apple.DiskManagement.disenter error -119930868.)" After the ps aux | grep fsck Terminal said - 4869   0.0  0.0 408628368   1648 s000  S+    3:07PM   0:00.00 grep fsck Do all the zeros mean this might not be the solution for my circumstance?