split manual

pertama=
dd if=debian-10.3.0-amd64-DVD-1.iso of=debian-10.3.0-amd64-DVD-1.iso.001 bs=1024 count=409600


kedua pakai skip=
dd if=debian-10.3.0-amd64-DVD-1.iso of=debian-10.3.0-amd64-DVD-1.iso.002 bs=1024 count=409600 skip=409600

ketiga pakai skip*2=
dd if=debian-10.3.0-amd64-DVD-1.iso of=debian-10.3.0-amd64-DVD-1.iso.003 bs=1024 count=409600 skip=819200


gabungkan=

dd if=part1 of=new_file bs=1024 count=3145728
dd if=part2 of=new_file bs=1024 count=3145728 seek=3145728
dd if=part3 of=new_file bs=1024 count=3145728 seek=6291456