sorry, me again!
In the descriptions of some SAS hard drives there is an 'SP' specified, and we can't find out what the meaning of this is ANYWHERE!
HP 146GB 3G SAS 10K SFF SP HDD
we know what all the rest is (well, except the 3G - but I'm taking that to mean 3Gb/s SAS throughput spec?)
So, what's the "SP" all about?!?
as always, many thanks for the help! :-)