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MGaluzzi
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?

jimlynch
08/26/2014
This article explains the differences between SATA 1, SATA II, and SATA III:

http://kb.sandisk.com/app/answers/detail/a_id/8142/~/difference-between-...
c
cchecca
08/25/2014

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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