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2017年6月8日に発売。A1418 / EMC 3069 / 2017 / 3.0 GHz quad-core i5, 3.4 GHz quad-core i5 or 3.6 GHz quad-core i7 Processor.

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iMac 21.5 2017 Fusion Drive: HDD to SSD - Inline sensor still required

Hi I have upgraded from iMac 2011 27” to iMac 2027 21.5” recently and planning on SSD upgrade. My machine does have fusion drive built in.

Just wanted to ask it seems 27” version still requires inline thermal sensor cable for any sort HDD replacement. Is this the case for 2017 21.5” version too?

Such part does not seem to exist for 21.5” which makes me think it’s not a requirement for 21.5 version?

Thank you for reading my post

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You are correct the 21.5” models don’t need the in-line sensor for the 2.5” SATA drive bay. But! You do need a drive which supports the latest version of S.M.A.R.T. services which is how this system gains access to the drives thermal sensor.

You do have a second issue! I’m assuming you are planing on taking the SSD drive from your 27” iMac to put in your 21.5” system. As I stated you need a newer version of there 2.5” drive (a SSD here) if you are planing on swapping it out. You may want to rethink that!

As you can’t use the 2.5” SSD with the PCIe/NVMe blade SSD your system has (A fusion drive is in fact two drives which are logically seen as one). Your systems two ports are in use! So you’ll end up swapping out your 2.5” SATA HDD which you could do. But your system performance won’t be that dramatically better! You also will end up needing to split the Fusion Drive before you do anything How to split up a Fusion Drive

So what would I do? There are two different directions:

One is to just go with an external Thunderbolt RAID drive system to hold my 2.5” SSD with a mate to create a mirror set. This would be the better direction if you have a 512 GB or larger SSD. Here you can then add in additional SSD’s (if you get a four bay box) to push things farther.

The other direction is to replace the PCIe/NVMe blade SSD to a much larger drive. Apple only puts in a small 32 GB drive in (way to small to hold a full OS & Apps and still have free space). While a lot more work it will offer much more performance than just adding the 2.5” SATA SSD alone. I would go with a 256 or 512 blade. If you really can swing it jump to a 1 or 2 TB blade! Then your system will scream!

RAID boxes:

Apple blade SSD’s:

Update (08/18/2018)

Here’s the IFIXIT guide you’ll need to follow: iMac Intel 21.5インチ Retina 4K Display (2017)ハードドライブの交換 and heres the guide for replacing the SSD: iMac Intel 21.5インチ Retina 4K Display Blade SSDの交換. You’ll also want this kit: [リンクされた製品が存在しない、もしくは無効: IF173-005] and you may want to order a second set of adhesive strips (just in case). Take your time and follow the IFIXIT guide techniques as its very easy to damage the display taking it off.

iMac Intel 21.5" Retina 4K Display (2015) Blade SSDの画像

ガイド

iMac Intel 21.5インチ Retina 4K Display Blade SSDの交換

難易度：

中レベル

—

2 - 3 hours
iMac Intel 21.5" Retina 4K Display (2017) ハードドライブの画像

ガイド

iMac Intel 21.5インチ Retina 4K Display (2017)ハードドライブの交換

難易度：

中レベル

—

1 - 2 hours

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Hi Dan thank you for your answer!

Actually I am already using My Samsung Evo 860 SSD (which supports SMART) in Thunderbolt 1 enclosure as a boot disk :)

I was planning on perhaps installing it internally so it is more secure and upgrade RAM possibly at the same time! - I did notice some random shut down at times in current set up and hence slowly planning for internal installation.

Blade SSD: I did not realise this was available to buy will consider this option too

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Hi Dan,

If I go this direction as suggested: (The other direction is to replace the PCIe/NVMe blade SSD to a much larger drive. Apple only puts in a small 32 GB drive in (way to small to hold a full OS & Apps and still have free space). While a lot more work it will offer much more performance than just adding the 2.5” SATA SSD alone. I would go with a 256 or 512 blade. If you really can swing it jump to a 1 or 2 TB blade! Then your system will scream!)

Will the following work ?

Replace internal fusion HDD to 1tb SSD Samsung 860 Evo,

Replace internal 32Gb PCIe/NVMe blade SSD to 512Gb from MacBook pro retina 2014

Replace 8gb Ram to 64gb Ram

Would i then setup up a fusion again or leaves 2 internal drives seperate ?

Cheers

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@Mark - First your system can only support 2 - SO-DIMM's: 8, 16, or 32 GB PC4-19200 (2400 MHz) (Core i3) or PC4-21300 (2666 MHz) (Core i5/i7) DDR4) so 32 would be the limit. But, before you do that what is your workflow? You maybe over buying the RAM.

I don't recommend Fusion Drives and having two SSD's setup as a Fusion set would be a waste! Two independent drives is what I setup in better than 75% of the systems I've setup, the other 25% are single drive'd setups as they didn't need to higher I/O a two drive offers.

Review this guide to figure out if the blade drive you have will work in your system and if it offers the performance you are expecting The Ultimate Guide to Apple’s Proprietary SSDs

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@danj - 2017 Imac retina 4k, 21.5inch 3.4Ghz quadcore i5

Workflow is the whole Adobe suite (photoshop, indesign, Afterfx, adobexd, illustrator)

Thats fair enough on the Fusion setup.

Looking at the Apple Ssd info the PCie drive I have is only Gen 3. Not really worth it.

So what option do you think suits best ?

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Do you think what the !&&*, open her up, throw in a sintech adapter with a compatible M2 drive ie. 4tb like a WD SN750 Black

Upgrade Ram to 32gb

and it'll fly ?

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@Mark - 32 GB only makes sense if you are leaving all of these open and running at the same time if you aren't jumping around then your given project would need to be quite large. 16 would be enough for most folks.

I really don't recommend using M.2 drives more so in iMac's as its so much work to get to the connection..

Other than using the custom Apple SSD's I would go with OWC. Most setups I do are 500 GB or 1 TB for students, for pro's who are working on large video projects I tend to install 2 TB drives only because rendering is better off the faster SSD.

In all of these setups the blasé SSD is the boot drive: OS & Apps, the rest of the drive is left empty for virtual RAM, caching and scratch space. Only the active project sits on the blade the rest of persons work sits on the SATA drive.

Even with the ultra large image work I do on a Mac Pro my internal SSD is only 2 TB! These are photo realistic stage drops and museum/presentation display back drops. I doubt you are working at these sizes.

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Ah I see, Thank you so much for your help Dan

Much appreciated

Cheers

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