SATA or SATA II

Hello,
please how can I determine if my SATA harddisk can be replaced by SATA II on my laptop (HP Compaq 6720s)?
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More about sata sata
  1. SATA II drives are backwards compatible with SATA I, so a newer drive will work with your system. It will just run at the speed limitations of the SATA I (not really a major issue :) )
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