Become a MacRumors Supporter for $25/year with no ads, private forums, and more!

Rgrindheim

macrumors newbie
Original poster
Apr 2, 2020
25
6
Norway
I have a late 2012 iMac 21.5 inch with 1TB HDD and 128GB SSD combined as a “fusion drive”. I’ve had to open the machine in order to fix the PSU and now that it is open it may be a good idea to consider upgrading the 1TB hard drive. I‘m considering swapping the HDD drive to SSD. If both drives are SSD, I assume there is no need for the drives being ”fused” together. Anyone have experience and/or recommendations?
 

mdgm

macrumors 68000
Nov 2, 2010
1,606
354
If both are SSD then yes you wouldn’t use a fusion drive setup anymore.

You can get a SATA III (6Gbps) 2.5” SSD

Another option is to replace the SSD already in the machine (need to get the right type as it’s a different form factor) with a higher capacity one.
 
  • Like
Reactions: Rgrindheim

Rgrindheim

macrumors newbie
Original poster
Apr 2, 2020
25
6
Norway
If both are SSD then yes you wouldn’t use a fusion drive setup anymore.

You can get a SATA III (6Gbps) 2.5” SSD

Another option is to replace the SSD already in the machine (need to get the right type as it’s a different form factor) with a higher capacity one.
Is it straightforward to un-fuse the drives? Will the 128GB drive then just act as a separate stand-alone drive? Alternatively, could the drives somehow be configured to behave like a single 1.128TB SSD drive?
 

mdgm

macrumors 68000
Nov 2, 2010
1,606
354
You can boot into the recovery partition or Internet Recovery and use Disk Utility, I think. If that’s not enough then you could use Terminal commands.

Configuring it to appear as “a single 1.128TB SSD drive” would mean that if either disk failed data would be lost.
 
  • Like
Reactions: Rgrindheim

Fishrrman

macrumors Core
Feb 20, 2009
22,948
8,730
"Is it straightforward to un-fuse the drives?"

That's going to happen whether you want it or not.

When you replace one of the drives in the fusion setup, the "fusion" will be destroyed and all data lost.

I don't see any reason to "re-create" the fusion drive.
Let each SSD now become "its own drive".

You could use the replacement SSD as your "main drive" -- everything on it.
You might consider installing a copy of the OS onto the original 128gb SSD, as well.
Reason:
Now you have an immediately-accessible SECOND BOOT DRIVE if the new SSD fails. You can get booted right back up, and work on the problem.
 
  • Like
Reactions: Rgrindheim

Rgrindheim

macrumors newbie
Original poster
Apr 2, 2020
25
6
Norway
"Is it straightforward to un-fuse the drives?"

That's going to happen whether you want it or not.

When you replace one of the drives in the fusion setup, the "fusion" will be destroyed and all data lost.

I don't see any reason to "re-create" the fusion drive.
Let each SSD now become "its own drive".

You could use the replacement SSD as your "main drive" -- everything on it.
You might consider installing a copy of the OS onto the original 128gb SSD, as well.
Reason:
Now you have an immediately-accessible SECOND BOOT DRIVE if the new SSD fails. You can get booted right back up, and work on the problem.
Yeah, I think this is the way to go (unless I decide to leave well enough alone).👍 Thanks for your input.
 

msiler

macrumors newbie
Dec 21, 2008
12
0
I am considering the same upgrade but have a few questions: I too have a Fusion Drive in my Late 2012 iMac 21.5", Can I "simply" remove the Fusion Drive's two parts (SSD and HDD) and then replace the two with only a single new SSD or do I just leave the old small (24GB) SSD where it is and just replace the HDD with my new 2TB SSD?

Lastly, will a Clone of my old Fusion Drive transfer to and read properly on the new single SSD drive or should I transfer everything over to the new drive via Time Machine? I ask because it is my understanding the the data will be lost when the Fusion Drive is broken apart by replacing either of the two connected drives...
 
Last edited:

Fishrrman

macrumors Core
Feb 20, 2009
22,948
8,730
"Lastly, will a Clone of my old Fusion Drive transfer to and read properly on the new single SSD drive or should I transfer everything over to the new drive via Time Machine?"

A clone will work fine.
Just create it BEFORE you "break apart" the fusion drive...:cool:
 
  • Like
Reactions: msiler

Rgrindheim

macrumors newbie
Original poster
Apr 2, 2020
25
6
Norway
"Is it straightforward to un-fuse the drives?"

That's going to happen whether you want it or not.

When you replace one of the drives in the fusion setup, the "fusion" will be destroyed and all data lost.

I don't see any reason to "re-create" the fusion drive.
Let each SSD now become "its own drive".

You could use the replacement SSD as your "main drive" -- everything on it.
You might consider installing a copy of the OS onto the original 128gb SSD, as well.
Reason:
Now you have an immediately-accessible SECOND BOOT DRIVE if the new SSD fails. You can get booted right back up, and work on the problem.
Ok, new SSD drive is installed and up and running. I did as you advised and created a 2nd boot drive on the 128GB SSD. Next job will be to reinstall data from Time Machine backup.
 

Attachments

  • IMG_3838.jpeg
    IMG_3838.jpeg
    864.8 KB · Views: 62

Dr Kevorkian94

macrumors 68020
Jun 9, 2009
2,153
41
SI, NY
Ok, new SSD drive is installed and up and running. I did as you advised and created a 2nd boot drive on the 128GB SSD. Next job will be to reinstall data from Time Machine backup.
Hi looking to d the same, quick question though what did you clone? The Full Fusion drive, the Macintosh HD, or the container?
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.