I had to format the new SSD via terminal because I didn't have a special install kit. Disconnect all other external drives, In Terminal type the following command, then press the Return key: diskutil list

When using terminal it is important to type all the commands exactly as they appear in this guide. Making a typo could result in lost data and time.

A long list of disks will appear; we need to find our target disk from this list. An internal drive should be the very first or second drive in the list (see image below). The majority of the list is going to be ignorable disk images. To find the internal SSD, look for the following: ‘(internal, physical)’ which is disk1 in the image, second entry.