How do I know if my Fusion disk is still running in Mojave ?

Question

How do I know if my Fusion disk is still running in Mojave ?

I have a 2017 iMac with a Fusion 2Tb disk. I have been told that now, having installed Mojave, I am NOT using the SSD part anymore but only the standard disk part. I still see 2Tb and didn't notice any particular delay. They also told me that my configuration could be with a single "fused" disk or I could have a 256 SSD + a 2Tb standard HDD that are "fused" only via-software. Basically this is an Apple choice and to know what I have I need to open the iMac. Is this true? If I go to SYSTEM REPORT (apple logo, about this Mac, system report) I only see a standard 2Tb disk.

1) Is there some sort of check I can do to see if I am still using the whole "fused" disk?

2) Is there a way to know for sure exactly what I have inside?

iMac 27" 5K, 10.14

Posted on Feb 1, 2019 9:23 AM

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Answer 1

rkaufmann87

Level 10

148,510 points

Feb 1, 2019 10:06 AM in response to MarcelloM1973

If you have a Fusion drive it is possible it became unfused. To verify if you have a Fusion drive, please run an ErtreCheck report and we can look to see if there is a SSD installed. If you are not familiar with EtreCheck please navigate to EtreCheck.com and download and run the report, then post it as your reply to this message. You will need to follow the instructions for posting it in https://discussions.apple.com/docs/DOC-250000211 you need this information as the report is long.

No personal information is in the report. We can also look it over to see if there are any obvious problems with your install.

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Answer 2

dialabrain

Level 10

136,235 points

Feb 1, 2019 10:34 AM in response to MarcelloM1973

FWIW, if you open Disk Utility and see more than one internal drive, your drive is no longer fused.

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Answer 3

rkaufmann87

Level 10

148,510 points

Feb 1, 2019 9:26 AM in response to MarcelloM1973

You were incorrectly advised, however if you want to verify please look at this thread https://discussions.apple.com/thread/6806133

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Answer 4

dialabrain

Level 10

136,235 points

Feb 1, 2019 12:01 PM in response to MarcelloM1973

By definition all Fusion drives are separate devices. An SSD component and a HDD component that are "fused" together by software.

I don't know why your SSD Controller is not listed. Mine is in my Late 2015 27" 5K iMac.

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Answer 5

rkaufmann87

Level 10

148,510 points

Feb 1, 2019 10:51 AM in response to MarcelloM1973

You do indeed have a Fusion drive and it appears to still be fused. If you still have concerns you may want to take it to your local Apple Store or AASP.

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Answer 6

Feb 1, 2019 9:30 AM in response to rkaufmann87

As I said I already did that procedure and I see only ONE standard 2Tb drive... but I am sure I bought fusion and I am sure I have fusion. What I am not sure is that Mac might have stopped using it after Mojave installation. As far as I understand there can be different combinations (1 disk with both ssd and hdd mounted on, or a separate SSD on the board + a separate SATA 2Tb drive). I think I have the latter but I am not sure. Is there some utility that allows to go deep and understand what is going on here?

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Answer 7

Feb 1, 2019 10:59 AM in response to rkaufmann87

Thanks.. if I go into SYSTEM REPORT I see this though...

So.. as far as I understand it... I have a normal HDD on the SATA and I have the SSD part directly on board, two separate devices... not a single one, fused via software.. .Correct?

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Answer 8

Feb 1, 2019 10:35 AM in response to rkaufmann87

Thanks... this is the DISK part of the log

Report (Disk Part)

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Answer 9

Feb 1, 2019 10:43 AM in response to dialabrain

This is what I have...

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How do I know if my Fusion disk is still running in Mojave ?

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