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Windows MBR Overritten by linux command dd if=/dev/zero of=/dev/sdb bs=512 count1

I know it's a stupid thing what I have done : In a Linux Virtual machine I did dd if=/dev/zero of=/dev/sdb bs=512 count1 to my external hard disk containing windows

Now I Cannot detect the external Hard drive in my windows machine. I thing the MBR Partition is gone

What to do now ? any way to resotre my data on the external Hard disk ?

You should be able to fix this from Linux, using the boot-repair tool:

More information is on the link given, and is too long to include all here.

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