http://www.anandtech.com/printarticle.aspx?i=2690
The original Raptor was launched as the
WD360GD in March of 2003 with an enterprise level 10,000 RPM spindle speed, SATA interface, 8-Megabyte buffer,
5.2 millisecond read seek time, and a single-platter design featuring 36 gigabytes of storage.
The next version of the Raptor was launched as the
WD740GD in December of 2003 and boasted several needed enhancements. These enhancements included the addition of another platter that increased the capacity to 74-gigabytes,
4.6 millisecond read seek time