Why doesn't he find my second hard drive?  

Hi,

I have placed an SSD card in my Imac and after a lot of trial and error he is doing great.

The hard disk originally in this Imac (WD, Sata ..) on it was replaced by a LACIE GRAND disk.

As a result, I have now made an external of my original disk and hoped that the external LACIE can now be used internally on my IMAC for extra data storage.

Unfortunately I can't find it anywhere in the finder or disk utility. Recovery mode also does not work. He can only find my external easily.

The connection was made according to all instructions that I could consult with the correct SATA data / power cable on the second port.

All tips are welcome!