Wirelessly posted (Mozilla/4.0 (compatible; MSIE 6.0; Windows CE; IEMobile 6.12) Sprint😛PC6800)
formatted hard drive capacities are less than the actual pesented capacity. (example: a 120 hd is often around 112 when formatted, the reason being hd's are done 1000 mb per gb, while the computer reads 1024 mb per gb.)
as for whether a mb is sr or pre-sr, the easiest way to check is to look at yourraphics card. during the last refresh before penryn, sr macbooks were released at 2.0 and 2.2 speeds, with the gma950 being upgraded to the x3100. so if you have an x3100 graphics card, you have the santa rosa chipset.