Difference between SATA I, SATA II and SATA III

sataWhat is the difference between SATA I, SATA II and SATA III?
A lot of people ask about the data speed of the different types of sata disks. This information is crusial if you are planning to upgrade an old pc but you don’t want to pay for specs that your pc can’t fully support.
This is also essential especially when you want to replace an HDD with an SSD on an old laptop. Can your laptop use the maximmum speed of the new SSD or you are just spending money?

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