Hi raf-pl,
Service Area information can be different for different manufacturers and models of HD. HD manufacturers don't share this information so it's pretty hard to get by. Most people here referee everyone to
http://www.t13.org/
for any HD related questions. If you have not taken a closer look at this site I would do this. But I don't think it will give you satisfying information on SA. I am still new at this forum as well and am not a HDDGURU! But take a closer look at (BEER) Boot Engineering Extension Record
and the following ATA command: "SET MAX ADDRESS" This should help point you in to the right direction.