Differences between SATA and SATA2 hard drives

SATA stands for Serial Advanced Technology Attachment and describes the way it conducts connecting to a computer system. As such, SATA and SATA 2 are interface types, which are used by the hard drive and motherboard. Hard drives themselves cannot differ except in the type of interface they use. The later SATA 2 improves the old design, mainly by increasing the interface speed. Speed
The original SATA is sometimes called SATA 1.5Gb/s, because of the 1.5Gb/s transfer speed it boasts. This translates to speeds of up to 150MB/sec. In contrast, SATA 2 , also called SATA 3.0 Gb /s, doubles that speed, resulting in speeds of up to 300MB /s . This significant increase in interface speed is the main difference between the two types of interfaces. Assuming a motherboard supports SATA 2, each hard drive will work with existing cables, although it won’t exceed its maximum interface speed.
Multiple devices
SATA 2 allows multiple devices to be connected via a port multiplier. In fact, SATA 2 allows up to 15 devices to be connected on a single line. In contrast, only SATA allows one device connected per line.

Real World Speeds
Just like the saying, “a chain is only as strong as its weakest link”, so is the case with hard drives. Mechanical hard drives are relatively slow compared to SATA interface speeds. In fact, the average hard drive can barely match the speeds of the original SATA interface, which means SATA 2 offers little realized speed advantage. Only when you use non-mechanical hard drives, such as solid state drives (SSD), can the benefit of SATA 2 truly be seen.

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