Which line did you comment out to try to preserve your data on sda4 ?
(megadoz said we could skip zeroing sda4 partition not the mkfs.ext4)
##makefilesystem in freshInstall.sh : mkfs.ext4 -b 65536 -m 0 ${disk}4 ##or zeroing in partitionDisk.sh : dd if=/dev/zero of=${disk}4 bs=1M count=32