WD HDD - First connected but later didn't work, why?

Hey Community,
Yesterday I connected my external hard drive to my macbook pro. I wanted to activate the time machine so I have space on my mac. When the time machine automatically came up I forwarded it to connect it to the Time Machine. When the process started I recognized that mac is completely restarting and formatting the hard drive so I searched for any button to cancel the process because I had lots of files in it.
But there was no button so I separated it by pulling the usb cable. Of course the process stopped but after that I tried to connect the hard drive again. Unfortunately it didn't appear anymore.
The disk utility recognizes the external hard drive but I can't see it on the finder. I also went to preferences on finder and checked the box for external hard drives. Still nothing appeared.
Can anyone please help me?
My Macbook pro is OS X Yosemite Version 10.10.2 and the hdd is WD Elements.

Still struggling to understand why copying the entire root dir to a disk image and then restoring from that image did not, as expected, yield an identical system, and why I even had to reinstall after doing this.
Because there is a lot more going on under the hood than merely copying files.
The only way to do what you want is to use cloning software like Carbon Copy Cloner.
My  advice is to rescue your personal files to a regular non-TimeMachine  external drive, Zero erase the ENTIRE drive and install OS X fresh and  update, then your programs from original sources and files from backup.
Then, make a bootable clone and you can copy that as many times as you want and each one is bootable.
Most commonly used backup methods
How to erase and install Snow Leopard 10.6

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