search each cylinder , find hard disk lost filesystem

gistfile1.rb

def oo(cylinder, sector)
  sector *= 512
  aa=<<-EOS
echo "cylinder: #{cylinder}"
losetup -o #{sector} /dev/loop1 /dev/sdb3
if [ $? -eq 0 ] ; then
  mount /dev/loop1 /tmp/11 2>/dev/null
  if [ $? -eq 0 ] ; then
    echo "offset #{sector} byte find a file system!!"
    exit 0
  fi
  losetup -d /dev/loop1

  sleep 0.1
fi

EOS
  puts aa
end

#  foreach cylinder, 0/1 header, 1 sector , find a file system
#beg = 30678
beg = 0 + 3900
eng = beg + 250
(beg..eng).each do |cylinder|
	sec0 = cylinder*255*63 + 0*63 + 1 - 1
	sec1 = cylinder*255*63 + 1*63 + 1 - 1
	oo(cylinder, sec0)
	oo(cylinder, sec1)
end