You might want to read
https://www.theregister.com/2021/12/10/friday_foss_fest/
Thank Bret Busby! downloading ventoy requires subscription, it's very bad it publish message digest without message
freebsd handbook
instruct users to create bootable disk
by dd with .img file
it seems that some
files are in two formats: .iso and .img:
http://ftp.funet.fi/pub/unix/FreeBSD/releases/i386/i386/ISO-IMAGES/13.2/
it implies that
some users can create bootable
disk only with .img (not .iso) files
my energy is limited, i give up
PS: my real problem
is with some win7 iso file (not freebsd file), i can't boot it