Question: External hard drive won't mount in high sierra
Is something broken in High Sierra when it comes to external USB HDs? Did something break in the USB stack?
Up until installing High Sierra I have been able to mount my external USB hard-drive with my MacBook Air. I now try connecting it and it will not longer mount. It isn't even listed in the USB devices section, when I check "System Information".
Originally I thought the drive was broken, but I did some digging and none of my Seagate drives will mount. Same issue with all of them (I have three Seagate drives: 2 FreeAgent GoFlex and 1 Backup Plus Portable Drive). They don't appear in the list of USB devices and no LED activity of the drives. They are all USB 3.0 based drives.
They all work on my old Mac Mini, which is running macOS 10.11.6. Two of the drives are HFS+ and the other is NTFS.
An older USB 2.0 based drive mount fine.
I am using macOS 10.13.1 on the MacBook Air.
MacBook Air, macOS High Sierra (10.13.1), null