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모델 A1419 / EMC 2806 / Late 2014 또는 Mid 2015. 3.3 또는 3.5 GHz Core i5 또는 4.0 GHz Core i7 (ID iMac15,1); EMC 2834 late 2015 / 3.3 또는 3.5 GHz Core i5 또는 4.0 GHz Core i7 (iMac17,1) 모두 Retina 5K 화면 장착

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Complete FusionDrive-ectomy procedure

I've got a Late 2015, 5K 27" Retina, Late 2015 iMac. I bought it new in 2017. It's still got Mojave installed. It does everything I need, and it provided nearly 5 years of faithful service - until this past weekend.

Long story made short, the Fusion Drive is bfu. Disk Utility was no help, so I ran DriveDx, confirming a drive fault. After perusing the repair details here on other Q&A, I had decided that I'd turn this over to Apple for repair; I took it to a "Genius" at the local Apple Store. However, after booting with Ctrl-R & running diagnostics for about 90 minutes, the "Genius" scotched that idea. He said they wouldn't repair a "Vintage" iMac, and my only alternative was to buy a new iMac! I commented that seemed odd: Apple claiming to be environmentally friendly, but consigns my iMac to the landfill because their "Fusion Drive" design was never ready for Prime Time. Then I left, resolved to take care of this myself.

Having read through some of the illustrated Fusion Drive repair answers, I think I'm familiar with the mechanical portion of the procedure. I'm far less comfortable wrt the software portion; i.e. splitting the drives, formatting properly, etc. I think perhaps the best way for me to structure my question is to outline what I think is the correct procedure & request feedback for any errors noted. Again, most of my uncertainty has to do with what and how to execute the software steps to achieve my objective.

My objective is a fully functional system using a single 2 TB SSD (I've had good luck with Crucial). If it has no negative side-effects, I'm happy to leave the dysfunctional Fusion-SSD in the system as it seems to require several additional steps. That said, here's my outline & some questions re the software steps; please provide corrective feedback where needed:

  1. "Split" the SSD and the HDD: This procedure was a "chosen solution", but I don't follow it - it seems to be written to be performed AFTER the physical drive replacement/removal, and I read somewhere else that the drives must be split before the physical removal???
  2. Obtain the proper tools & crack open (carefully) the shell to access the HDD. This procedure seems to be the correct one for HDD removal? I assume a 2 TB Crucial drive will serve adequately as a single drive - replacing both the HDD and the SSD?
  3. Removing the SSD seems covered in this procedure, but as I mentioned: I would prefer to just leave it in the system if there's no downside to that. Hoping that software & drive configuration can effectively "remove" this SSD from the system?
  4. If possible, I'd like to verify that everything is working before re-assembling the clamshell.
  5. WRT the OWC temp sensor: Based on this discussion, is it still true that I will not need the temp sensor kit for my iMac?
  6. I know I'll need to make a bootable USB drive to install Mojave on the new SSD. I am assuming that nothing special will be required after the repair; i.e. install OS, then restore files from Time Machine?? (I've never restored a TM backup, but I do have one for this machine).

So that's all I can think of - any and all suggestions and corrective feedback will be much appreciated.

iMac Intel 27" Retina 5K Display 하드 드라이브 이미지

안내서

iMac Intel 27" Retina 5K Display 하드 드라이브 교체

난이도:

운영

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1 - 2 hours
iMac Intel 27" Retina 5K Display Blade SSD 이미지

안내서

iMac Intel 27" Retina 5K Display Blade SSD Replacement

난이도:

어려움

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2 hours
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What is your workflow?

Are you a creator type dealing with photo's, artwork or video? If you are you should replace the NVMe blade SSD with a 500 or 1TB blade drive to hold your OS and apps leaving a good portion of the drive empty so it can be used by the OS and apps for virtual RAM and cache space and lastly if your apps use scratch space aim it to this dive.

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No - I don't consider myself a creator "type". I edit the occasional video with iMovie, use `ffmpeg` occasionally for FLAC conversion, and occasionally do a bit of software development. If I wanted to do more of that, I'd look into a Mac Pro - or something along those lines. No - I'm just an average Joe Shmoe who needs a reliable computer for my day-to-day activities. I do like the idea of "re-purposing" older Macs to run Linux - I've got a 2011 17" MBP that I dual-boot macOS & Ubuntu (https://github.com/seamusdemora/seamusde...) - I use it regularly. This iMac will pull similar duties I expect. I appreciate the question, but I *think* I'll get all the performance I need without a NVMe Blade. OTOH, if there are sound logistical reasons for adding that I'm happy to try it!

The way I see it is that I'm saving loads postponing the purchase of a new Mac, so I've got the budget to try some things. Do you feel the NVMe will make a significant diff in performance?

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@jamesmoore - Here's a useful reference on Apples custom NVMe drives: The Ultimate Guide to Apple’s Proprietary SSDs

NVMe is a storage protocol designed specifically with SSDs in mind. With the elimination of the intermediating SATA HBA layer, NVMe allows SSDs to communicate directly with the CPU via the PCIe bus, opening channels for groundbreaking performance improvements. To put it into perspective, the performance limit of the SATA III bus is 6Gb/s, meaning a SATA SSD can offer a max of 550MB/s of throughput after overhead. A single PCIe 3.0 lane can offer 1GB/s (bidirectional) of throughput, so a PCIe 3x4 SSD can reach a throughput of up to 4GB/s read/write. That goes up to 8GB/s (bidirectional) for PCIe Gen 4X4 SSDs. The performance limitation here moves from the protocol to the NAND media, which has been undergoing tremendous development in recent years, allowing manufacturers to squeeze the highest density and performance into the smallest form factors.

While a bit more expensive the performance is light years over SATA I/O! While you are more a dabbler I think you'll find having a dual drive rig with two SSD's will give you what this system is lacking. Using the NVMe drive for your boot, apps then leaving the rest free to give the OS and Apps elbow room for virtual RAM, caching & scratch space. Just going with a 500GB should be more than enough for your needs.

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@danj - Thanks, Dan - If I understand your recommendation, you're suggesting I modify my proposed procedure as follows:

1. DO NOT "split" the drives

2. Replace the HDD (as planned); a 2TB SATA SSD will serve as the replacement.

3. Take the extra steps, remove the existing, tiny SSD from the iMac, and replace it with a 500GB NVMe SSD. Do you have a recommendation for the NVMe part(s) I'll need, and/or "must have" specifications?

Is that correct - have I "got it"?

If so, I'll have a few more questions which I can ask here in a follow-on comment - or create a new question. Which would you prefer?

Thanks once again!

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1 - Wasted effort

2 - Good!

3 - Yes! Here's the needed drive and kit iMac Intel 27" (Late 2013-Mid 2015) Blade SSD Upgrade Bundle (480GB)

If you have more on this subject just plug them in here.

의

Thanks for all of that, but I guess you missed the first line of my question:

"I've got a Late 2015, 5K 27" Retina"

The OWC Aura Pro X2 SSD is not compatible with my Late 2015, 5K 27" Retina iMac.

Am I back to "Plan A" now? ; i.e. split drives, SATA SSD only

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@seamusdemora - Others have used it without issues, I really don't see why it won't work. As long as you are sure you have the Late 2015 model.

The Late 2015 offers a x4 8.0 GT/s PCIe/NVMe interface. The Mid 2015 offers a x2 5.0 GT/s PCIe/AHCI interface.

Here's the Apple blade SSD's:

AHCI version - Custom 512GB Samsung SSD

NVMe vision - Custom 512GB Samsung SSD

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On their website, OWC singled out the "Late 2015, 5K 27" Retina iMac, Model ID: iMac 17,1" as being incompatible with the "OWC Aura Pro X2 SSD". Here's the link, please check it out yourself: https://eshop.macsales.com/shop/ssd/owc/.... See the fine print just below the list of kits; it states: "NOTE: Aura Pro X2 is not compatible with iMac17,1 (Late 2015)."

I followed up with a call to OWC's tech support team to learn more details, and inquire about alternatives. Their phone #: 800-496-1081‬. The person I spoke with assured me the information on the website was correct; i.e. no NVMe SSD for iMac Model # 17,1. He verified this with his colleague(s) while we were on the phone. He said it was a physical size issue; because Apple doesn't follow industry standards for these items.

But I would love to hear from someone who could confirm that they have used this SSD in this model iMac... do you recall any of the others who've done this successfully? Maybe they used another mfr's part??

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