Aug 23, 2014

Does it make a difference if a 7200rpm HDD is connected to SATA II or SATA III port?

I understand that SATA III could be faster with a SSD, but is a 7200rpm HDD fast enough for the increased transfer rate of SATA III to offer any advantage over SATA II?

This article explains the differences between SATA 1, SATA II, and SATA III:


SATA II is going to have 300MB/s max transfer rate. You have to look at your drive’s maximum throughput and read/write throughput, and not just max external transfer rate which is only part of the picture. I looked for a listing of various 7200rpm drives - the one I found is a little dated, but you were seeing max in the 120MB/s range, which is not going to be impacted by the SATA II transfer rate.  There are faster HDDs now, but as far as I know, none of them are above 300MB/s so I wouldn’t worry about it. However, as you noted, SATA II could be a bottleneck for a SSD, so if there is a chance that you will want to upgrade to a SSD, you should go SATA III. 

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