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2012 MacBook Pro SSD Upgrade, Slow Link Speed

I upgraded a Mid-2012 MacBook Pro with a Samsung 850 SSD last night, something I've done many times over the years. But last night I ran into a little bug. While the computer supports 6 GBps SATA, the drive only connects at 3 GBps. I can't figure out why? There's no reason it shouldn't connect at full speed. The computer supports it, the drive supports it. Samsung drives are the best, most reliable SSDs you can get. I've installed probably a hundred of them over the last few years. Also I know it's not a bad hard drive cable because I also replaced that with a brand new one as part of this upgrade.

I had this Mac sitting on the counter next to my own, which happens to also be a Mid 2012 MacBook Pro with an SSD upgrade. My 6 Gigabit link speed and 6 Gigabit negotiated speed. But the one I was upgrading only shows a 3 Gigabit negotiated speed.

There aren't any jumpers on the drive that I'm aware of, so no way to "force it" to run in 6 Gbit (SATA III) mode.

Any thoughts?

I have three: 1) the new cable you installed may be the problem even though it is 'new'. There've been lots of complaints among DIYers of eBay dealers selling used cables as new and inferior cables from eBay and other dealers. And it is just possible that you got a bad cable from a reliable source. 2) You inadvertently damaged a good cable during the installation or the SSD is defective. 3) The problem is an incompatibility between your computer and the Samsung SSD. We saw some issues a couple years back with Samsung SSDs failing to boot Macs but working fine with PCs. Samsung tech support was spectacularly unhelpful (this was an issue I personally faced). I've bought nothing but Crucial SSDs since.

最后更新：2017-09-12 20:29:34

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