See/read Mac mini hard drive from MacBook Air? My Mac mini crashed during an OS upgrade and my display simply looks a bit like my opening screen but is refreshing (jumping around?) rapidly with no way to make any keyboard input.  I'd rather not do a reset as I have some   files I want to keep.  

Is there a way I can use my MacBook Air via USB or any other method to access/transfer the files so that I might retain them?
Allan’s response makes sense to me. I have been pretty successful retrieving files from Mac Minis using a USB to SATA adaptor. I use a Newer Technology USB 3.0 Universal Drive Adapter https://www.newertech.com/storage/

For guides to extracting the drive from the Mini, I rely on iFixIt. https://www.ifixit.com/Search?query=Mac+mini+drive

Denny