Welcome to the dskalyzer wiki!
Ingest your disk collection, so dskalyzer can report on them:
dskalyzer -ingest "C:\Users\myname\LotsOfDisks"
Find Whole Disk duplicates:
dskalyzer -whole-dupes
Find Active Sectors duplicates (inactive sectors can be different):
dskalyzer -as-dupes
Find Duplicate files across disks:
dskalyzer -file-dupes
Find Active Sector duplicates but only under a folder:
dskalyzer -as-dupes -select "C:\Users\myname\LotsOfDisks\Operating Systems"