Hi AcWxRadar... yes, I agree, not documenting this kind of stuff makes us costumers more smart, but having documented this issue would have saved me so many hours, headaches and money... well, anyway, now that it is solutioned and working I will forget this bad time (sometime).
Regarding the speed and how to change it... it depends on the hard drive... some of them is set via a jumper setting and some of them via software... in my case, the documentation of the hard drive was also very bad done, so I had to lose hours to discover it had to be done via a program Samsung provides. In its paper documentation they said it was done via a jumper setting, which the only thing it did is DISABLE the hard disk (it was unrecognized after setting the jumper they said)... but looking further in its web, I saw a program which let you change the speed...
This is a link to the "fake" instructions...
http://downloadcenter.samsung.com/co...ATA_eng_r4.pdf
This didnt' work in my case...
And this is the link to the program which really let me change the speed of my hard drive to 1.5Gb
SAMSUNG Hard Disk Drive - support - utilities
Hope it helps anyone in my situation...