HDD in Optical Drive Not Readable

Hello. I just installed a 1TB HDD in my optical drive. When I turn on the computer a screen pops up and "the disk you insterted is not readable." Thus, the disc is not in the list of devices in finder. However, when I open disk utility, I can see the disk but cannot verify the disk, repair the disk or anything else. I can partition the disk or something like that. It says under "partion map scheme: unformatted." I can hear the hdd spinning as well. I dont know if this has something to do with anything. If anyone knows anything about what I should do or what the problem is I would greatly appreciate it.
Thanks in advance.

sure, create folders and drag and drop or export your collections, it behaves internally the same way an external HD does.
create and structure your files for easy finding of your data.
If I can manage 40 Terabytes this way over many diff. HD, anyone can do same on a single HD.
There are other ways to structure files, and fancy APPS for same,
look into an extremely useful tool called PATHFINDER for Mac.

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