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After carefully removing screen and replacing the fusion with a mercury ssd, the iMac boots with a black screen and takes five minutes to get to sign in screen. Thereafter it works perfectly. I tried booting from and external ssd drive with clean Mojave os, with same result. After the iMac runs for an hour or so and is shut down, I can reboot with same black screen but only takes a minute to reach sign in. Any suggestions!
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I promise you the 2012 systems (and all others) with a Fusion Drive are in fact dual drived!
It has a SATA HDD and a PCIe Blade SSD. Each uses its own connection to the logic board:
Here’s how one can create a Fusion Drive in an older Mac system https://www.macworld.com/article/2014011... Here we’re using two SATA based drives (HDD & SSD).
So it sounds like the flash drive is still present.
The problem you are facing right now is the blade SSD is the still active boot drive looking for the HDD mate of the Fusion Drive set.
Basically, the Fusion Drive was not properly broken up before swapping out the SATA HDD for the SATA SSD.
So what to do??
Putting back the HDD and then breaking the Fusion Drive following this: How to split up a Fusion Drive. Then the blade SSD can be disabled by reformatting it and leaving it as is.
The alternate way is to remove the blade SSD.
Often I find people are willing to go with a better blade SSD in place of the small SSD Apple installs with it’s Fusion Drive setup. A PCIe/AHCI SSD drive in this series.
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Thanks for getting me straightened out on the blade ssd. So can the blade ssd be removed and the new ssd installed without the blade in place.
Status. I am still stuck. Diskutil shows no cs volumes. Disks present -0 blade ssd, 1 new ssd, 2 synthesized (new ssd) which has preboot, recovery,vm. I can’t split fusion since no uuid. See info re create a fusion but unclear which number drives to use, ie: 0 & 1 or 0 & 2. Any help would be appreciated.
Instructions are at: https:/www.macworld.com/article/2014011/how-to-make-your-own-fusion-drive.html
You can't add the drive until you first remove the one you took out from the Fusion Drive set.
I think for you, the brute force method is what you'll need to do here. As you haven't got the original HDD drive to put back to undo the Fusion Drive setup.
Open the system up and take the logic board out to gain access to the SSD blade drive so you can physically remove it.
As it turns out I put the defective hdd back in and linked it back up using the new resetFusion command in diskutil. I can now try to split the link and install a new ssd drive. Macworld instructions indicate it SHOULD work . We shall see. Last time I tried it would only do if it was another hdd.
Finally broke fusion link and installed new ssd. Now have two distinct ssd drives
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Did you pull both drives?
The SATA HDD & the blade PCIe SSD on the other side of the logic board.
Dan さんによる
I don’t think the late 2012 has a PCie blade ssd. The iMac had a fusion drive which supposedly has a built in ssd and spinning drive combo
Jabrain さんによる
A Fusion Drive is physically two drives! In this series two SATA based drives. In the newer models you have a SATA HDD and a blade PICe/NMVe.
Dan さんによる
@capeparadise you were able to solve this problem you have, I have the same problem as you, I would appreciate any information
francis さんによる