How Can I Delete Some Disk Images in My Recovery Partition? When I updated my mid-2011 MacBook Air from Sierra to High Sierra last year I had some installation issues... which resulted in creating at least 2, maybe 3 disk images in my recovery drive.

I have disk image files where they don't belong (like keychain)and my system compensated by putting them in other locations. 

The repercussions are greater than I can list here... The two that are most troublesome are: 

/dev/disk4 in /Volumes and /dev/disk12 on /Volumes/untitled.

-bash-3.2# mount

/dev/disk1s1 on / (hfs, local, read-only)  
devfs on /dev (devfs, local, nobrowse)  
/dev/disk3 on /private/var/log (hfs, local, union, nobrowse)
/dev/disk4 on /Volumes (hfs, local, union, nobrowse)
/dev/disk5 on /private/var/tmp (hfs, local, union, nobrowse)
/dev/disk6 on /private/var/run (hfs, local, union, nobrowse) 
/dev/disk7 on /private/tmp (hfs, local, union, nobrowse)
/dev/disk8 on /System/Installation (hfs, local, union, nobrowse)
/dev/disk9 on /private/var/db (hfs, local, union, nobrowse)
/dev/disk10 on /private/var/folders (hfs, local, union, nobrowse)
/dev/disk11 on /private/var/root/Library (hfs, local, union, nobrowse)
/dev/disk13 on /private/var/root/Library/Containers (hfs, local, union, nobrowse)
/dev/disk14 on /Library/Preferences (hfs, local, union, nobrowse)
/dev/disk15 on /Library/Preferences/SystemConfiguration (hfs, local, union, nobrowse)
/dev/disk16 on /Library/Keychains (hfs, local, union, nobrowse)
/dev/disk17 on /private/var/tmp/RecoveryTemp (hfs, local, union, nobrowse)
/dev/disk18 on /private/var/tmp/InstallerCookies (hfs, local, union, nobrowse)
/dev/disk2 on /Volumes/Macintosh HD (hfs, local, journaled)
/dev/disk12 on /Volumes/untitled (hfs, local, nodev, nosuid, no owners)
None of those are a real problem in that they interfere with recovery functions. 

Why wouldn’t you make a bootable installer and then boot from that (or internet recovery) and just delete your recovery and re-run the os installer?