Problem Solved, thank you for your input it certainly helped in my thinking. I thought it must be a simple solution and it was. I tried removing the main SSD from it's slot and plugged it into the second HDD space, turned the laptop back an and it worked as though everything was fine, There are a number of metal connections in the HDD spaces and obviously the HDD or SSD must be in an appropriate Caddy for the laptop to recognize that there is a HDD in place, just need to order myself a second HDD Caddy and I should be up an running with a new dual disk laptop, putting an extended life into my 6 year old and very efficient P870 Toshiba. Thank you again.