Most hard drives come out of the box unformatted or formatted in
a way that Macs can't use. You need to format (initialize, erase)
the drive. Use Disk Utility.

Volume format should be Macintosh OS Extended.
Name is whatever you like.

A question: Are you sure that Hitachi drive's slot is compatible with
the slot in the MBP's case? The Mac is a tad quirky. Many laptop
drives will fit in the space, but the drive slot is out of alignment
with the opening. Either higher or lower. I forget.