Little knowledge about hard drives: It is necessary to explain the data transfer rate of Serial ATA. In terms of serial communication, the data transfer rate refers to the actual bit rate of data transmission through the serial interface. The transfer rate of Serial ATA 1.0 is 1.5Gbps, while Serial ATA 2.0 has a transfer rate of 3.0Gbps. Like other high-speed serial interfaces, Serial ATA uses an encoding mechanism to ensure the characteristics of the data stream. This mechanism encodes the original 8 bits of data per byte (i.e., 1Byte = 8bit) into 10 bits of data (i.e., 1Byte = 10bit). As a result, each byte of the Serial ATA serial data stream contains 10 bits of data. After encoding, the Serial ATA transfer rate becomes one-tenth of the actual transfer rate. Therefore, 1.5Gbps = 150MB/sec, and 3.0Gbps = 300MB/sec.

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