Recover data from external hard drive that was Windows format and connected on a Macbook Pro. Did I lose everything? What happened?

Hi there this is my first question here!
I connected my external hard drive originally formatted on PC on my new Macbook. The first time I connected it I could see all my files but today I connected it and after I couldn't see any file nor even on my pc appears as NO NAME with a different name and nothing on it. I think was reformatted, any help to recover all my data?
It's really important stuff for me

If the Apple Store couldn't get files off of the drive, it is unlikely that you will be able to. If you have backups, those would be the best way to go. You could also try booting up the computer and holding down T to boot into Target Disk Mode. Plug the broken computer into another one with FireWire and see if it works to recover data from external hard drive. If you can see it, try booting up the broken computer while holding down Option. Choose Recovery HD from the menu, then choose to Reinstall OS X.
It is unlikely that this will work, because I'm pretty sure that the Apple Store would have tried this. You could try using expensive software to get files off the drive, but it would be risky and the results might not be any good.
https://discussions.apple.com/docs/DOC-4273

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