I use a PNY Elite Portable SSD. I downloaded High Sierra and, after restarting my MacBook Pro ... I received an error message stating my PNY SSD could not be repaired by First Aid. I still have access to files on the SSD but cannot use it as a drive.
After downloading High Sierra I could not use my
PNY Elite Portable SSD as a drive. I can access my
files on the SSD.
MacBook Pro (13-inch Mid 2012), iOS 11.0.3