SATA I and SATA II: difference?

here is a little bit information, hope can help you more First-generation SATA interfaces, also known as SATA/150 or SATA 1, run at 1.5 gigabits per second (Gbit/s). Serial ATA uses 8B/10B encoding at the physical layer. This encoding scheme has an efficiency of 80%, resulting in an actual data transfer rate of 1.2 Gbit/s, or 150 megabytes per second (MB/s) (or 146.48 MiB/s). The relative simplicity of a serial link and the use of LVDS allow both the use of longer drive cables and an easier transition path to higher speeds. than for sata II, 3 Gbit/s signaling rate was added to the PHY layer, offering up to twice the data throughput. Like SATA 1.5 Gbit/s, SATA 3.0 Gbit/s uses 8B/10B encoding, resulting in a maximum data transfer rate of 2.4 Gbit/s or 300 MB/s for the wire. However, hard drives cannot supply data nearly at these speeds, so the actual speed depends on the hard disk.

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