Cannot access external hard disk

I keep all my data in Segate external hard disk. Today I wanted to set up windows using Boot camp. The window installed but at the end it froze. By mistake I kept the External hard disk connected to my Macbook Pro. When I rebooted I cannot find the my external hard disk. I tried to access through Mac partiton but it displays waring.
Saying I need to Initialize the external hard disk. That mean I will end up with erased hard disk which is not i want. Is there any option. ?
It looks like Mac OS cant recognise the drive at all. When I open the Disk Uitiluty I can see the drive.
Any ideas guys

Try opening Disk Utility and try repairing the disk. It might hopefully be able to repair it. Otherwise you're probably looking at needing a tool like DiskWarrior 4…

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