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Alvin777

macrumors regular
Original poster
Aug 31, 2003
122
3
Hi Apple and Mac friends.

In System Information > SATA Device Tree

It says Apple SSD Controller is "Unknown". It also says:
"No" to both Native Command Queuing and Detachable Drive.

Is it detecting that there is an SSD there? How can it be revived?

Thank you.
God bless, Rev. 21:4
Screen Shot 2021-09-15 at 9.51.41 AM.png
 

Nguyen Duc Hieu

macrumors 65816
Jul 5, 2020
1,451
389
Ho Chi Minh City, Vietnam
Hi Apple and Mac friends.

In System Information > SATA Device Tree

It says Apple SSD Controller is "Unknown". It also says:
"No" to both Native Command Queuing and Detachable Drive.

Is it detecting that there is an SSD there? How can it be revived?

There is no SATA SSD in your iMac.
There is no T2 chip (to lock SSD) in your iMac => "Unknown"
 
Last edited:

Fishrrman

macrumors Core
Feb 20, 2009
22,744
8,582
A 2015 iMac with a 2tb fusion drive should have inside TWO drives:
- 128gb SSD (I think it still had the larger SSD back then)
and
- 2tb platter-based HDD

These two drives are "fused together" by the OS so that they will appear as only ONE drive "on the desktop".

But... looking at your original post...
What is wrong?
Does the Mac boot?
Once you're in the finder, does it run ok?

Are you just wondering about the indication you're seeing in System Information?

So long as the Mac boots and runs, again, is there a problem?
 
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Alvin777

macrumors regular
Original poster
Aug 31, 2003
122
3
Hi. The Mac et
A 2015 iMac with a 2tb fusion drive should have inside TWO drives:
- 128gb SSD (I think it still had the larger SSD back then)
and
- 2tb platter-based HDD

These two drives are "fused together" by the OS so that they will appear as only ONE drive "on the desktop".

But... looking at your original post...
What is wrong?
Does the Mac boot?
Once you're in the finder, does it run ok?

Are you just wondering about the indication you're seeing in System Information?

So long as the Mac boots and runs, again, is there a problem?
Hi. The Mac can't see the SSD part of Fusion. System Report is seeing it as Unknown (check screenshot above on original post), Disk Utility can't see it nor Terminal.

Is there a way firmware flash this Apple Blade SSD? I've already fresh installed macOS Big Sur but only the hardrive. The SSD has somehow split (possible the last Windows app I used caused it) and it Unknown now by the Apple SSD controller but it's still there it seems.
 

Nguyen Duc Hieu

macrumors 65816
Jul 5, 2020
1,451
389
Ho Chi Minh City, Vietnam
Hi. The Mac et

Hi. The Mac can't see the SSD part of Fusion. System Report is seeing it as Unknown (check screenshot above on original post), Disk Utility can't see it nor Terminal.

Is there a way firmware flash this Apple Blade SSD? I've already fresh installed macOS Big Sur but only the hardrive. The SSD has somehow split (possible the last Windows app I used caused it) and it Unknown now by the Apple SSD controller but it's still there it seems.

What makes you think there is an SATA SSD in your iMac?
You haven't digested this thread thoroughly.
If you had, you wouldn't have beaten around the forum for the same issue.

 
Last edited:

Alvin777

macrumors regular
Original poster
Aug 31, 2003
122
3
What makes you think there is an SATA SSD in your iMac?
You haven't digested this thread thoroughly.
If you had, you wouldn't have beaten around the forum for the same issue.

Hi. It’s a 2TB fusion (one hardisj, one Apple Blade SSD- I didn’t remove anything).
 

Nguyen Duc Hieu

macrumors 65816
Jul 5, 2020
1,451
389
Ho Chi Minh City, Vietnam
Hi. It’s a 2TB fusion (one hardisj, one Apple Blade SSD- I didn’t remove anything).

You know why you are ignored? You stick you mind to your own bias.
The "Apple Blade SSD" in your iMac is an nVME blade, not a SATA blade.

Read this post again (you've already read it but didn't understand) and take a close look at every photo in it, the guy has the same iMac as yours, and his description is super detailed.

 

Alvin777

macrumors regular
Original poster
Aug 31, 2003
122
3
You know why you are ignored? You stick you mind to your own bias.
The "Apple Blade SSD" in your iMac is an nVME blade, not a SATA blade.

Read this post again (you've already read it but didn't understand) and take a close look at every photo in it, the guy has the same iMac as yours, and his description is super detailed.

Hi. It’s ok we’ll figure it out (Apple Blade SSD is AHCI, I wish it was NVME with regular connectors but it's on a PCIe 3.0 bus).

Thanks, Peace.
 
Last edited:

Alvin777

macrumors regular
Original poster
Aug 31, 2003
122
3
What shows up in System Profiler under NVMExpress?
Hi. It says:

"This computer doesn’t contain any NVMExpress devices. If you installed NVMExpress devices, make sure they are connected properly and powered on."

(This SSD is in a Late 2015 5K iMac, the 128GB Apple Blade it uses I believe is still AHCI. I wonder if this is a software issue? I did the Hardware Diagnostics it says "No Issue" and reset the PRAM 4x, SMC's been reset too)
 
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