[SOLVED] Link speed vs. Negotiated Link Speed

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ScarySulley

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Apr 16, 2013
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Looking in my Mac Pros system profiler and checking my four internal HDs, I noticed two speeds: "Link Speed" and "Negotiated Link Speed." All but one HD have both speeds as 3.0 Gigabit (assuming that means 3Gbps), but one HD shows a Negotiated Link speed of 1.5 Gigabit. I also see that only this HD shows a rotation speed of 7200RPM, where the other three don't have that info listed.

Why the difference?

Mac Pro is from early 2008 if that matters running OS X Snow Leopard 10.6.8
 

JustSomeJoe

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Link Speed is the maximum speed the SATA port can handle, Negotiated Speed is (just what it says) the current "Negotiated" speed; when the negotiated speed is lower than the link speed it means something isn't capable of *reliable* transfer at the link speed, could be the drive or the cable, or even a high error rate; check the drive spec first (see if it's capable), then have a good look at the cables (or back-plane) & SATA connectors.
 

JustSomeJoe

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Link Speed is the maximum speed the SATA port can handle, Negotiated Speed is (just what it says) the current "Negotiated" speed; when the negotiated speed is lower than the link speed it means something isn't capable of *reliable* transfer at the link speed, could be the drive or the cable, or even a high error rate; check the drive spec first (see if it's capable), then have a good look at the cables (or back-plane) & SATA connectors.
 
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