The difference between the SATA3.0 interface on the hard disk and SATA2.0 has five aspects:

specification, interface transmission standard, volume, interface rate, and transmission speed.

1. Different specifications

Compared with the SATA 2.0 version, the final specifications of SATA 3.0 have doubled the bandwidth to 6Gb/s.

At the same time, a number of new technologies have been added, including the addition of NCQ commands to improve transmission technology and reduce power consumption during transmission

.
2. Different interface transmission standards

SATA 3.0 adopts the new INCITS ATA8-ACS standard and is compatible with old SATA devices. It not only further improves the transmission signal technology, but also greatly reduces the power consumption during SATA transmission.

3. Different sizes

SATA 3.0 provides a LIF interface (Low Insertion Force Connector) that is smaller than the general SATA interface,
specifically for 1.8-inch storage devices, including the upcoming 7mm thick optical drive.

4. Different interface rates

The SATA2.0 interface rate is 300MB/s, and the SATA3.0 interface rate: 600MB/s.
5. Transfer data

The most critical difference between Sata2.0 and sata3.0 is the transmission speed. The maximum transmission speed of sata2.0 is 300m per second, while the maximum transmission speed of sata3.0 can reach 600m per second."