Thanks for the link. I've read that the poster in question used 2 HDDs in single format via eSATA, and I'm not sure if it would be the same as putting 4x2TB HDDs as a single volume [JBOD - spanning] which is what I require. I'll just have to read a little more on internal port multipliers on HDD enclosures. I need to know if the plug supports port multiplier.