Question: what is the difference between sata 3g and sata 6g?
Answer: 3G and 6G is referenced to a speed, meaning a maximum of 300MBps for 3G and 600MBps for 6G. ... SATA I=1.5G, SATA II=3G and SATA 3=6G. In most cases 6G SSDs or HDDs will be backwards compatible with 3G and 1.5G speeds however 3G SSDs or HDDs will only be backwards compatible with 1.5G speeds.