Mac mini 2009 ssd yosemite
If you read this post: From my experience I have used almost any 6Gb current drive on any old MacBook system. All current 6 Gb drives you can hardly find a 3Gb anymore are autosensing. Seems there is something special going on with the Nvidia MCP79 Mac Mini not communicating with the drives controller specially the Sandforce but also Samsung.
The drive jumps back to its lowest possible speed which is 1. I have not seen jumpers on 2. Correct the Nvidia controller has a problem running Auto sense drives. That was the point. And yes SSD drives don't have jumpers any more as they are auto sense. Different SSD manufactures do auto sense differently.
Some like the MacBook Pro's won't allow the better auto sense drive link up as their clocks are slightly off. So this is where the older fixed drives are needed and harder to find now. As to the Apple drive: To my surprise, I found the link operating at 3 Gbps.
I had no illusions that the failed firmware loader had miraculously updated the firmware, but I found it curious that the link would be at 3 Gbps after trying to boot from the CD. I ejected the CD and restarted the Mini, only to find it back at 1. Even after several restarts it stayed at 3 Gbps, as long as the CD was in the drive.
I can now repeatably and reliably get the link to run at 1.
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Based on my observables, I would isolate the finickyness of the NVidia MCP79 chipset to a timing issue at boot—if you allow the startup to occur normally, the link negotiation will fall back to 1. If you instead interfere with the startup, say by having a CD in the drive or by running Startup Manager, the link will negotiate to 3 Gbps.
I'd be curious to hear how other SSDs fare with this solution; I'd also be interested in whether the CD solution works on an internal Superdrive. Thanks diablote for a really great post! You did some good investigations here. The buggy NVidia SATA chipset has a negotiating problem and your testing shows that is is a timing problem on startup. The chipset does not really care if the drive is 6 Gbps or 3 Gbps but is saying " can I negotiate with you - can you do 3 Gbps? The Sandisk firmware is forcing the drive from 6 Gbps to 3 Gbps which maybe the chipset understands then faster.
I wonder if you tried my approach with leaving the SSD on power-only for some hours? Since the last upgrade to OS X I have not upgraded to OS X I came across your USB power-only post and was about to try it when I found the Sandisk firmware addressing the issue leading to the workaround I described. Given the trouble of opening the dang Mini and how seldom I restart it it's an always-on file server , I probably won't get around to it soon. Sure let us know if you test the RAID 0 setup. I fear newer SSD drives will be even more incompatible in the future to downgrade to 3 Gbps but then again how long will a Mac Mini last?
Seems these macs last forever. Wow, that is a fast mac, really. The link speed issue persisted and still persists , and the power-only mode you recommended did not fix it. Further testing showed that the link speed is actually just random, and no interaction at startup influences the outcome. Out of 43 startups 21 restarts, 11 startups from off, and 10 startups from off with Startup Manager , I got 25 at 1.
The highest number of startups at the same link speed was 4, and the minimum was 1.
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Interestingly, the second SATA channel always came up at 3 Gbps, though the speed of the volume went as the link speed of the first channel. Hi diablote, did you try the trick with an external CD to delay the startup? Would be interesting to see if a delayed negotiation would help. Show 13 more comments. In "early " SanDisk works sometimes 3Gbit, sometimes it goes to 1,5Gbit. I cannot understand what affect at behavior like that.
CAUTION! SSD Drives and Yosemite [u] | Larry Jordan
At this time no solution for this Mac. In "late " I had the same problem. Then I noticed a small switch in my Optibay. So this solves the problem.
BENCHMARKED: Mac mini 2009 + Yosemite = MEGA slow!
Sadly, the logic board has an issue which you can't over come with the SSD you are using. The sensory logic can't reliably tell what the systems SATA port speed is so it jumps down to the slower speed to make sure it will work your SanDisk zs GB drive. OK what to do? If you can't get the zs to work you'll need to get different drives or accept the fact you'll only get SATA I performance in this series of Mac Mini.
SanDisk zs specs. Mac mini 2. Is it correct? Show 11 more comments. B 2 bazooka9. Now i think about a gb version. I just rotated the whole assembly over to the left, leaving them attached, just make sure everything else is disconnected. For the most part I think the rest is pretty straight forward if just follow the steps, although my way was probably more of a pain when lining up and securing the screws.
Make sure to follow everything again when assembling too, a lot of times people forget about one of the connectors. Thanks guys for the input. I didn't realize how straight forward it would be Besides the 'T' boot target keyboard trick, are there any other mac bios shortcuts I should know of? I've done a ram upgrade on my mac mini in the past so I know the whole putty knife and the crazy amount of tiny screws and tweezer work. I guess everything can't be that easy. Heh, totally forgot you needed to do all that for the RAM in those too. For startup shortcuts Apple covers that: For this reason, please contact the manufacturer of your SSD system — and read the supporting articles — before upgrading to Yosemite.
Make sure you KNOW that your drive will work before you have problems. You can read their entire article here: We have old and new drives and many of them are being continuously pounded on by our testing mechanisms. For the past two years, we have been paying attention to TRIM states on various drives and finally last year configured 2 Mac Pro 4,1 units as isolation units running We also run similar tests with drives from OCz, Seagate, Micron, and a couple of rebranded units.
Mac Mini only runs 1.5 gigabit on SSD
Most of these have also lived very grueling lives in our labs and we have seen no issues with or without TRIM enabled. Finally, many of the drive manufacturers offer a new garbage collection mechanism that has no requirement on TRIM for keeping things cleaned up. Crucial and Samsung do on their current drives and I believe that Seagate and Intel either are shipping or will be shipping drives with this feature.
Where we have found TRIM useful? We have a database server that we test against and when we simulate 35K IOPs or more, we do see a difference in the benchmarks compared to the same drive with TRIM enabled. Larry thanks for the update, I have been following this for months now.
I just upgraded to Nothing in the linked article seems to describe the steps one must take. My recommendation to you is to not bother with it if your SSD is newer than 1 year old. As I mentioned in my post above, we are really not witnessing any noticeable performance differences under Your email address will not be published. Access over 1, on-demand video editing courses. Become a member of our Video Training Library today!