Question about replacing internal Fusion hard drives

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iMac Intel 27" EMC 2639

Model A1419 / Late 2013 / 3.2 & 3.4 GHz Core i5 or 3.5 GHz Core i7 Processor, ID iMac14,2

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Carlo D @carsfixit20

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发帖于: 2020年8月30日

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Question about replacing internal Fusion hard drives

I have a question. I am currently running Catalina on my late 2013 27 inch iMac. My iMac has a fusion drive which has a 3TB HDD and a 128 PCle SSD. I bought a SSD that will replace my mechanical 3TB HHD, as well as a larger PCle SSD that will replace the 128GB SSD on the mother board.

I was told I don't need to do anything but replace both of these and I will be able to use either of the new ones for what ever I want and that they will both show up in disk utility and I can format them each separately and use either one or even use them both as separate boot drives with macOS on one and another macOS on another one. When I read this post I noticed that someone asked the question about splitting the fusion drive in order to be able to access both the new drives seperatly when the new ones are installed. Will I need to worry about this or am I good to remove them both and replace them both with new ones and be able to access both of them to use separately?

I was planning to clone my entire iMac to one of the new SSDs before I open up the iMac. Then replace the internal hard drives. I am not trying to create a fusion drive inside the imac when I replace both hard drives. I am only trying to replace them both and use them separately inside. My only concern is will I be able to access the PCle SSD once I install it? I know I will not have any problems accessing the regular SSD that replaces the mechanical HDD.

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jacobkamminga @sjakio 声誉积分: 13 2 · Answer 1 · 2020-09-02T18:39:08-07:00

jacobkamminga @sjakio

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发帖于: 2020年9月2日

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Yes you can split the fusion drive. You can even do it before you replace the drivees.

See this article: https://www.lifewire.com/split-fusion-dr....

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jacobkamminga thanks for your reply. I am tying to find out the purpose of splitting or not splitting the fusion drive.

1. I was told it does not matter about splitting the fusion if I want to replace both the HDD drive and the PCIe drive with new ones. I was told I would be able to access both new drives but they would be separate drives and would not be a fusion once I install the new ones.

I am simply trying to fully verify that I will be able to access the new PCle drive after I install that if I did nothing to the factory drives prior to removing them.?

由 Carlo D 完成的 2020年9月3日

@carsfixit20 I believe that will be the case. In the worst case scenario you can reformat the PCIe drive after it's installed using Disk Utility from Internet Recovery Mode.

由 Zach 完成的 2020年9月3日

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jacobkamminga @sjakio 声誉积分: 13 2 · Answer 2 · 2020-12-06T17:46:44-07:00

I would suggest to do the following.

A Time Machine backup (or 2), Maybe one to a network storage and one to a local attached usb/firewire disk.
Then replace the 2 disks.
Do a fresh install of Catalina, you will get an option to choose one of the new disks.
During install use to option to Recover from a Time Machine backup and use the one on the local attached disk.

Some more detail of the fusion drive.

If you go into terminal and type:

% diskutil list

You will see something like below. it shows your current ssd and hhd, /dev/disk0 and /dev/disk1 in the list below. After that you see another disk which is: /dev/disk2 (synthesized) which is the fusion drive.

That is where your information is stored. When you do the fresh install, the install proces will create the required disk layout with the recovery partition etc.

Diskutil list output:

/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *121.3 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_APFS Container disk2 121.1 GB disk0s2

/dev/disk1 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *1.0 TB disk1

1: EFI EFI 209.7 MB disk1s1

2: Apple_APFS Container disk2 1000.0 GB disk1s2

/dev/disk2 (synthesized):

#: TYPE NAME SIZE IDENTIFIER

0: APFS Container Scheme - +1.1 TB disk2

Physical Stores disk0s2, disk1s2

1: APFS Volume imac01 - Data 761.6 GB disk2s1

2: APFS Volume Preboot 81.4 MB disk2s2

3: APFS Volume Recovery 529.0 MB disk2s3

4: APFS Volume VM 4.3 GB disk2s4

5: APFS Volume imac01 11.3 GB disk2s5

iMac Intel 27" EMC 2639

Question about replacing internal Fusion hard drives

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