I decided I wanted to upgrade my 256GB SSD drive that shipped with Mac Pro 2013, I contacted a seller on eBay and been asked to check whether my Mac has an Apple “Blade” SSD slot? To be honest, I did a bit of searching and now completely confused about what a blade slot is? Could someone kindly explain the importance of blade and does this refer to new SSD specs, such as my Mac Pro 2013 or pre-2013 SSD's? I guess it's really important! Many thanks in advance.