If the message says that SFSformat is not an executable, then this could mean that the protection bits in the C: directory are not correctly set for this instruction.
Try this from a shell:
protect C:SFSformat RWED
and if there more problems like that in C: then try this:
protect C:#? RWED ADD
But you should read the AmigaOS manuals, because a computer is not a toy, it's a machine that needs exact instructions.
Formatting the drive DH0: with the same name DH0 is not good idea. For ClassicWB it should get the volume name System:
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