Two external volumes that have I / O errors. This is a small part of the console output. One is an SSD and the other is a normal hard drive. Both are relatively new.
default 18: 46: 56.035095 -0800 kernel disk2s2: I / O error
default 18: 46: 56.084555 -0800 kernel disk3s2: I / O error
default 18: 46: 56.133860 -0800 kernel disk2s2: I / O error
default 18: 46: 56.182963 -0800 kernel disk2s2: I / O error
default 18: 46: 56.232262 -0800 kernel disk3s2: I / O error
default 18: 46: 56.288224 -0800 kernel disk2s2: I / O error
What would explain the I / O errors for two different volumes?
Both are connected directly through a USB-C hub. The same problem occurs when they are connected separately through a USB-C to A cable to my MacBook Pro.
All the diagnostic tools I have tested say that the units are fine. This includes Techtool Pro, Drive Genius and DiskWarrior. The console does not show I / O errors while these tools perform a surface exploration or reconstruction.
When mounted for the first time, both units appear normal, but after 30 to 40 minutes, both remain mounted but all the files are missing in the Finder window.
duh from a terminal it shows that all top-level folders are empty but there are no sub-folders. After reassembling each unit, all files are intact.
Is there any way to rule out / hardware problems and if so, how? Could it be an HFS / AFPS problem? Both units are HFS but the start volume is AFPS. At this point I do not believe that they are the units themselves.