There's a bit more to my story.
The Plextor drive came with a single cable. You'd think that they (a highly rated drive manufacturer, would know that it needs a double wouldn't you?).
The double one came with a Samsung external dvd (normal) drive. Which worked for about an hour. So, sent it back. Replacement arrived, noticed that it slightly re-designed. That couldn't even run its' own drivers disc. So that went back. And a replacement is on its' way. Curiously, they don't seem to need the double lead.
I've been advised that one should only use a blu ray drive for blu ray discs because they wear out quite quickly. (Probably hearsay, but who knows).
Meanwhile, the Plextor has an infuriating problem. It's a top loader and the release for the lid hasn't got the oomph to lift itself.
Sent it back. Replacement arrived. Just the same. Glued a bit of rubber in near the hinge and it's fine. The replacement came with another single cable.
Added to which I'm now on my third MicroSoft Wireless 7,000 keyboard and mouse. First mouse did insane things. Second keyboard was dyslexic.
I really am beginning to doubt trusted manufacturers quality control.
Sorry that turned into a rant. Had to tell someone.