Hi ,
after some searches on google , i've found that WD HDD Scorpio needs a special command before they can accept commands to read/write from the SA .
This commands [to set the HDD in superon mode] should be 80h command that doesn't appear on ATA specific commands, but i don't know what paramenters to set on the other registers .
Can somebody help me ?
Thanks .

If you don't know this command (also known as techno-key) what are you going to do inside SA? You have to understand structure of firmware, functionality of modules, other commands to work with SA, etc...
It's not all that easy