External Hard drive is not detecting

I recently converted my external hard drive from FAT32 to NTFS using the Command Prompt as outlined on your website. Everything was working fine, I copied a 7GB file to it and everything worked. The next day I switched on my PC, I couldn't and still can't
find my external 2TB hard drive by my computer. When I plug it in, it is detected by my computer as an external USB mass storage device, but it doesn't appear in the my computer folder. I can also see it in the device manager and the disk management tab of
the manage settings. The system thinks that the partition is healthy. I just can't seem to access it. Please help. I have about 500 to 800 GB of data on it that I really don't want to lose. Its a Seagate back up plus HDD. It has no switch, it switches
on automatically when you plug in the USB. The light on the HD also turns on, and I can feel the disk working inside when I touch it. Thanks in advance. Any help would be appreciated.
P.S. I am using Windows 7 enterprise N edition on a 64-bit Lenovo tablet, if that helps at all.

Check out this video where you can find how to access lost data from hard drive using Windows Data Recovery Software.
https://www.youtube.com/watch?v=dr_ILgDR-fo&list=UULodHE9xBVuqW4ep5Mkxqmw

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