Trying to add NVMe M.2 SSD to PCIe - Issues

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iMac Intel 27インチ Retina 5K ディスプレイ

対象のモデルはA1419 / EMC 2806 / Late 2014 または Mid 2015。 3.3 または 3.5GHz Core i5 または 4.0GHz Core i7 (機種ID iMac15,1)、EMC 2834 late 2015 / 3.3 または 3.5 GHz Core i5 または 4.0 GHz Core i7 (機種ID iMac17,1)のRetina 5Kディスプレイを搭載したすべて。

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Julian N @juliann61115

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投稿日: 2023年2月18日

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Trying to add NVMe M.2 SSD to PCIe - Issues

Hi Peeps. I have a late 2015 27” iMac that came with a 128GB/3TB Fusion Drive that is nearing the end of its life.

I purchased a Crucial 4TB P3 NVMe SSD, and have tried two different NVMe/PCIe adapters, but when i install them and the new SSD, I get no power in the iMac.

I have stripped it down and put it back together 6 or 7 times now. There’s nothing when i press the power button. I have discovered the 4 LED’s on the motherboard that are meant for diagnostics. With the NVMe drive in, none of them light up. When i put the old 128GB PCIe drive back in, the first light will pop on, and I have put it all back together with the old drives in and it boots up fine.

(I did break the power button cable when removing it from the groove in the left speaker, but i have fixed that with heat shrink tubing, so it’s not causing this.)

I have tried booting from a USB and formatting both original internal drive(s) and the new NVMe blade (in an external case), but no joy when installing the blade on the motherboard. I wondered if it have something to do with the “fusion” element of the existing drive, and tried splitting it, but i had already formatted it, and trying to get a drive list to pop up in the Terminal window to do this, doesn’t work per instructions I have followed. So the Fusion Drive is still “intact” in that sense, just freshly formatted.

Any ideas? Is the P3 drive just not compatible with this iMac? Are the two different NVMe to PCIe adapters not functioning or compatible? Is it do to with the Fusion Drive having not been split before i formatted it?

My backup is that i can get a SATA adapter/mount and put the new 4TB NVMe SSD there, but I’d obviously like to benefit from the better speeds of the PCIe socket….

Many thanks in advance,

Julian

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Dan @danj

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Let’s clarify a few issues here

You can’t use a PCIe/NVM M.2 SSD via the systems SATA port.

Apple’s blade connection is custom offering a few other signal lines as such a M.2 really don’t work that well.

OK, What is a better option? While a bit more expensive OWC offers a pin compatible SSD, you could also get a real Apple SSD.

IFixit offers the OWC SSD iMac Intel 27" (Late 2013-Mid 2015) Blade SSD Upgrade Bundle

And here’s a source for the real Apple SSDs Apple custom SSPOLARIS SSDs

Upgrade your iMac with a new SSD to dramatically speed up your machine, and use your original SSD in an external enclosure.の画像

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iMac Intel 27" (Late 2013-Mid 2015) Blade SSD Upgrade Bundle

$199.99

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Ahhhh. Okay, i was looking at 2.5” adapters that are for M key only, not the type of pins an NVMe blade has…

The Apple OE units are expensive and only go up to 2TB, same with OWC…

Okay, running low on options then. Running the OS from an External NVMe USB enclosure had issues that I wasn’t entirely happy with. I was mistaken, SATA is now out. There’s external Thunderbolt enclosures, but they’re pricey.

Any ideas why the Crucial unit is not working?? Why there appears to be no power reaching the diagnostic lights while it’s installed? I have read something about length of pins being out, but it seemed that pins were too long, not too short.

I’ve forked out for the 4TB crucial blade and am not sure i can return it, so need to find an option where I haven’t wasted $300 on a 4TB USB drive.

Julian N さんによる2023年2月18日

@Julian N - There are some possibilities we can do to salvage the M.2 SSD using an external case either USB or if you can find a Thunderbolt 2 case (they are hard to find now). I would still try to return it or at least see if you can sell it.

As to size as much as we want deep storage there are some limitations! Here it’s the physical size and how these denser blade SSDs are cooled.

That in turn gets into the Read/Write of the drive. I prefer the term data churn as often times it’s not a canonical operation appending data to a current file, instead it’s a replacement of the file be it larger or smaller. As an example a cache file this data churn can be hard on SSDs as they are not able to be constantly re-written without risk of failure.

Because of this the boot drive should be independent from one’s data drive as you can replace that drive more readily as it’s only the OS and Apps that reside on it.

So here a a 512GB or 1TB blade SSD should be more than enough space. Leaving a good potion unused so wear leveling can move the data to less worn blocks. Then use the SATA port to hold your bigger data drive.

Dan さんによる2023年2月18日

Hi Dan, thanks for your input. I understand, and it’s good advice.

I’m going to try to return the 4TB NVMe.

I’ll probably get a 1TB NVMe, and then a 2TB SATA SSD, per your advice.

I’ve been trying to find successful upgrades that others have achieved and am looking at a 1TB WD Black SN750 NVMe, and a 2TB Samsung 870 EVO SSD. It looks like I’ll have to disable sleep due to wake from sleep issues other have experienced. I already have the two different Sabrent adapters for the NVMe, and will need a 2.5” mount adapter for the SSD to replace the OEM seagate HDD.

Do these new purchases look like they’ll work from your better, more knowledgable vantage point?

Am i missing anything?

Many thanks in advance, Dan.

Julian N さんによる2023年2月19日

@Julian N - I get it! M.2 SSDs are cheaper! But they don’t offer the full compatibility as a direct Apple SSD or one that was designed to fully integrate into Apples systems. I’ve had to pull quite a few out as they tend not to hold up to what the clients I deal with push.

So I always go with either an Apple blade SSD or OWC’s offering as it was designed to be fully compatible.

Don’t get me wrong I love M.2 SSDs I have a RAID box which uses them. I had wished Apple would have made the smart move to support the industry standard, they had with SCSI, PATA and SATA in the case of storage. So why throw their customers under the bus here? All they are doing is creating rancor with their customers. There was no need. Even when they jumped to Flash only modules in the new Mac Pro, iMac Pro and Studio systems making so you can’t upgrade or even repair is just not smart!

So the bottomline here is I won’t put an M.2 SSD in an iMac, at least in a MacBook Pro you don’t need to pull the system fully apart to get to it.

Dan さんによる2023年2月19日

Thanks Dan. I’ll try an OWC 1TB blade (do you work for OWC?? 😆). Does it matter which iMac one? Having trouble locating the right one off Amazon here in the UK…

Also, is it worth merging them back into a a Fusion Drive after they’re installed and working? My Time Machine backup is of the original 3TB fusion, so it’s not going to work to restore it onto a 1TB - it’ll tell me the drive is too small right?? Is there a way around this?

Julian N さんによる2023年2月20日

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Ahhhh. Okay, i was looking at 2.5” adapters that are for M key only, not the type of pins an NVMe blade has…

The Apple OE units are expensive and only go up to 2TB, same with OWC…

Okay, running low on options then. Running the OS from an External NVMe USB enclosure had issues that I wasn’t entirely happy with. I was mistaken, SATA is now out. There’s external Thunderbolt enclosures, but they’re pricey.

Any ideas why the Crucial unit is not working?? Why there appears to be no power reaching the diagnostic lights while it’s installed? I have read something about length of pins being out, but it seemed that pins were too long, not too short.

I’ve forked out for the 4TB crucial blade and am not sure i can return it, so need to find an option where I haven’t wasted $300 on a 4TB USB drive. — Julian N
@Julian N - There are some possibilities we can do to salvage the M.2 SSD using an external case either USB or if you can find a Thunderbolt 2 case (they are hard to find now). I would still try to return it or at least see if you can sell it.

As to size as much as we want deep storage there are some limitations! Here it’s the physical size and how these denser blade SSDs are cooled.

That in turn gets into the Read/Write of the drive. I prefer the term data churn as often times it’s not a canonical operation appending data to a current file, instead it’s a replacement of the file be it larger or smaller. As an example a cache file this data churn can be hard on SSDs as they are not able to be constantly re-written without risk of failure.

Because of this the boot drive should be independent from one’s data drive as you can replace that drive more readily as it’s only the OS and Apps that reside on it.

So here a a 512GB or 1TB blade SSD should be more than enough space. Leaving a good potion unused so wear leveling can move the data to less worn blocks. Then use the SATA port to hold your bigger data drive. — Dan
Hi Dan, thanks for your input. I understand, and it’s good advice.

I’m going to try to return the 4TB NVMe.

I’ll probably get a 1TB NVMe, and then a 2TB SATA SSD, per your advice.

I’ve been trying to find successful upgrades that others have achieved and am looking at a 1TB WD Black SN750 NVMe, and a 2TB Samsung 870 EVO SSD. It looks like I’ll have to disable sleep due to wake from sleep issues other have experienced. I already have the two different Sabrent adapters for the NVMe, and will need a 2.5” mount adapter for the SSD to replace the OEM seagate HDD.

Do these new purchases look like they’ll work from your better, more knowledgable vantage point?

Am i missing anything?

Many thanks in advance, Dan. — Julian N
@Julian N - I get it! M.2 SSDs are cheaper! But they don’t offer the full compatibility as a direct Apple SSD or one that was designed to fully integrate into Apples systems. I’ve had to pull quite a few out as they tend not to hold up to what the clients I deal with push.

So I always go with either an Apple blade SSD or OWC’s offering as it was designed to be fully compatible.

Don’t get me wrong I love M.2 SSDs I have a RAID box which uses them. I had wished Apple would have made the smart move to support the industry standard, they had with SCSI, PATA and SATA in the case of storage. So why throw their customers under the bus here? All they are doing is creating rancor with their customers. There was no need. Even when they jumped to Flash only modules in the new Mac Pro, iMac Pro and Studio systems making so you can’t upgrade or even repair is just not smart!

So the bottomline here is I won’t put an M.2 SSD in an iMac, at least in a MacBook Pro you don’t need to pull the system fully apart to get to it. — Dan
Thanks Dan. I’ll try an OWC 1TB blade (do you work for OWC?? 😆). Does it matter which iMac one? Having trouble locating the right one off Amazon here in the UK…

Also, is it worth merging them back into a a Fusion Drive after they’re installed and working? My Time Machine backup is of the original 3TB fusion, so it’s not going to work to restore it onto a 1TB - it’ll tell me the drive is too small right?? Is there a way around this? — Julian N

iMac Intel 27インチ Retina 5K ディスプレイ

Trying to add NVMe M.2 SSD to PCIe - Issues

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iMac Intel 27" (Late 2013-Mid 2015) Blade SSD Upgrade Bundle

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