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发布于 2012 年 6 月, 型号 A1278. Intel 处理器，支持 Turbo Boost, 最多 512 MB DDR5 显存

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Why is my new Samsung EVO 860 soooo slow after installation?

Hi All,

Just as a forward, I have been all over reddit and ifixit looking at many similar questions but with slight variations and none of those fixes have worked for me.

I recently endeavoured to take this old MacBook Pro 13 (2012) and breathe new life into it with a new battery & SSD. Battery and SSD physical installation went fine. Unfortunately, from the very start I have had many problems with the software and experience of the SSD. First, it was nearly impossible to get MacOS onto the SSD as the download and install process would take hours and inevitably crash; after many days and failed attempts I finally got a High Sierra installation successfully into it, but when booting up and even after logging in, the performance was extremely, extremely laggy; slower than AOL dial-up laggy.

I tried an NVRAM and SMC reset, no change. I have been virtually unable to even find let alone install a firmware update for the device as Samsung’s website only seems to have updates available for the 850 EVO (mine’s an 860). I have heard conflicting reports about the problem perhaps being the internal SATA cable connector. My technically-oriented friends say that’s highly unlikely, and indeed it works fine still with the base HDD. However, when I have the SSD hooked up through an external SATA-USB housing, it runs smooth as butter. So, could that really be it? Would I need a specific kind of SATA cable for it to make a difference? (there doesn’t seem to be anything obviously wrong with my current one)

I am wondering if it’s not it, if there are other optimisations I need to make between the rest of my MacBook’s hardware and this new, alien SSD I am introducing. Please help, I’m going crazy after weeks of trying different things, and would like to save myself €50 on the SATA cable that the iFixit guide recommends since it doesn’t seem any different from the OEM one I have…

Cheers,

Desperate Newb

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I suggest you to make weekly backups, so was not too worried about it. This model is giving problems for many users I suggest to you get it services often from professional and keep proper backups.

Regards,

Gadget Genie

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@playerofmemes - Sorry to say you do have a bad cable here.

Let’s use an analog to see what’s happening here. Here in Boston we get major traffic jams in the morning rush when one of the major highways gets an accident. Some cars & trucks can sneak through but others get blocked until they can get around the blockage. Now if this happened in the early morning before the traffic built up the few cars & trucks on the highway have no real problem getting by.

So how does this apply to my problem??

This gets into more than the SATA I/O speed of your system which is SATA III (6.0 Gb/s) in this case your original Apple drive might be only a SATA II (3.0 Gb/s) drive and to add to this its only a 5200 RPM drive. So the amount the data flow at max is not pushing the ability of the SATA port on your logic board. So if you have a fatigue cable or one which is only rated for SATA II you won’t encounter any issues at all! (Think of the 2AM traffic flow). Now you’ve put in a very efficient SATA drive which can push the limits of the SATA III (6.0 Gb/s) channel. Now think how much data could flow across that weak or under rated cable!

OK, so I need a new cable! Here’s the correct cable you’ll need MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable and here’s the guide MacBook Pro 13" Unibody 中期2012 硬盘线缆替换. But even this is not enough! You need to also need to place a strip of electricians tape on the uppercase where the cable crosses over to help protect it from the rough aluminum surface. Then the way you fold the cable is important! A common issue I see is people over do the folding which fatigues the thin foil wires. Here we need a arch not a sharp fold. To help here I use a BIC pen ink straw to help me roll the cable into a nice radius curve that way I don’t damage the wires.

Now the last part once you replace the cable you’ll want to backup your drive as you’ll need to reformat it and do a fresh install again as you may have some corrupted blocks that need to be reset.

MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable图片

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MacBook Pro 13" Unibody (Mid 2012) Hard Drive Cable

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I thought it wouldn't show any problems if it was running on negotiated SATA II speeds. I just did a HP ProBook the other day which would only work on IDE and SATA 2 and we installed a WD Green 240GB 2.5" SSD which was a night and day difference between the slow 5400RPM hard drive.

I suppose if the hard drive cable is damaged and is causing data transfer / I/O read and write errors that would explain it or trying to run at SATA 3 speeds but is bottlenecked by the cable.

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@benjamen50 - The original cable was only rated for SATA II (3.0 Gb/s) so if you had the original drive (SATA II) you wouldn't have encountered issues. Which is the first reason you need to replace the cable as the systems I/O could over saturate the cable if you put in a SATA III (6.0 Gb/s) drive.

This is where it can be an issue with a higher speed HDD (SATA III) as the condition would only pop up during the upgrade process when the OS installer was running and yet appear OK. With SSDs it's almost all of the time as in this case.

Even with a newer SATA III cable I've seen issues as the cable has gotten damaged from the rubbing of case or improper handling of the cable damaging it in the process.

As a rule of thumb I always replace the HD cable when ever I put in a SSD. As you really can't tell the differences between some of the versions and the best version which is being produced now.

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Hey Dan!

Thanks for that really thorough breakdown, that's the most concrete explanation I've seen about this potential causation.

I went for the EU version: https://eustore.ifixit.com/en/Parts/MacB...

I am hoping this resolves it, it's being overnighted so I will follow-up here if it works out.

I was/am just a little hesitant since I don't see anywhere in the product description that the new part is SATA III-rated or anything so I wasn't sure it would make any difference.

Cheers

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@playerofmemes - Apple was never open on what the specs of their drives are. Even today Apple only give you a very limited throughput numbers. Its sites that benchmark drives is where you'll get the info on the drives them selves.

Unlike desktop systems which use a standard SATA cable laptops all use a custom cable and rarely tell you anything more than the part number or revision here the 923-0104 is SATA III, 923-0741 is SATA II cable, If you get it with the bracket its this one 923-0084 and the older 821-1492.

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This makes it even more confusing since both the SATA III and II part numbers are listed there. How do i tell which one I bought here through the ifixit store?

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A few questions, when installing MacOS High Sierra (HS) or higher. Was the drive formatted as Mac OS Journaled / GUID Partition Table before installing?

Don’t think it’s a SATA cable problem because it works fine on hard drive. Since HS is installed, do an update to Mojave while booted into MacOS via App store to ensure the firmware ( SMC / BIOS ) on the board is updated to a newer version.

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Hi Ben,

Thanks, I have tried a basic Mavericks install, a latest Mojave install, and only recently am on High Sierra. I can certainly try a Mojave update this way, and am happy to do that, will try now.

The SSD has been and is currently formatted as Mac OS Extended (Journaled) with Scheme: GUID Partition Map.

Will update to Mojave now to see if it helps. I am not sure this matters, but since it’s entirely unusable when inside the unibody so i’m doing everything through the external case currently.

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@benjamen50 - Its the cable Ben!

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I had the same problem. Suddenly the laptop started to malfunction and the spinning wheel kept turning even when I was trying to enter the password. I put the old hard drive in and it was working, slower of course but fine. While the old hard drive was working properly, with the SSD I could not for any reason install the new operating system. It took many hours for this, and then it failed. I got the laptop and went to an authorized repairer right away and the problem was what I was thinking about. The hard disk cable was damaged although not visible. They changed it and now it's fine. They told me that many macbook’s had the same problem.

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