Mac didn't recognise Externel Hard Drive

Hello guys, I have HP external hard drive yesterday I put some files in it but today when I tried to open my drive it says  Mac cannot read this. But the files in drive is very important because of that I can't initialise it please help to open my hard drive without having to delete any file

Hoe is it formatted?  Click on the HDD icon COMMAND+! and post the information.
Ciao.

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