Disk Utility cant repair my external hard drive?!

I'm using a 1 TB WD external hard drive on my Macbook Pro (OS is still Snow Leopard).
It was working just fine until a few days ago the hard drive does not show on finder. I tried to repair it with disk utility but it gave the following message
"Disk Utility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files."
Of course I cant back up my files, it doesn't even show on finder! It doesn't show on other macs and PCs either!
I did my research on the internet and tried the following commands on Terminal
mount /dev/disk1
and it says "unknown special file or file system."
mount force /dev/disk1
and it says "/System/Library/Extensions/ufs.kext failed to load - (libkern/kext) not privileged; check the system/kernel logs for errors or try kextutil(8).
UFS filesystem is not available."
What does that mean??
I can reformat my hard drive but it has 500 GB worth of files and I'd rather not loose them if possible.. Is it possible?
I'm also trying to save my files using this software Disk Drill, but it takes forever and the showing files doesn't have the proper name.
Is there anything else I could try? I'll really appreciate any kind of help. Thanks!

Use a product such as DiskWarrior to repair the drive; you’re supposed to make backups to guard against future trouble and not while having it.
(108938)

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