The first SATA models appeared in 2003.
The SATA I (1.x revision) interface, known as SATA 1.5Gbps, is the first generation of SATA interface clocked at 1.5Gbps. The bandwidth that is supported by the interface can reach 150MB/s.
The SATA II interface (2.x revision), known as SATA 3Gb/s, is a second generation of interface clocked at 3.0 Gb/s. The bandwidth that is supported by the interface can reach 300MB/s.
The SATA III interface (3.x revision) that appeared in 2009, known as SATA 6Gb/s, is a third generation SATA interface clocked at 6.0Gb/s. The bandwidth that is supported by the interface can reach 600MB/s. This interface is retrocompatible with the SATA II 3 Gb/s interface.
The SATA II features offer retrocompatibility to operate on SATA I ports.
The SATA III features provide retrocompatibility to operate on SATA I and II ports.
However, the speed of the disk will be slower due to the speed limitations of the port.