Upgrading Fusion Drive to SSD, With added RAM - How and What Parts

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iMac Intel 21.5" Retina 4K Display 2015

A1418 / EMC 2833 / Late 2015 / 3.1 GHz Core i5 or 3.3GHz Core i7 Processor. Released October 13, 2015.

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Kenneth Jackson @kennethjac96905

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发帖于: 2020年10月26日

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Upgrading Fusion Drive to SSD, With added RAM - How and What Parts

My 3.1GHz quad core i5 fusion drive iMac appears to have 2 drives; an NVM Express 24Gb Apple SSD AP0032H that I believe holds the OS. Then a 1Tb standard hard drive for data and apps. I’d like to upgrade to a 1Tb SSD. I’m assuming the 24 Gb Apple SSD would stay installed, with the new 1Tb SSD replacing only the old HD. So how would I clone the new SSD and get just the data and apps on it? And what is the RAM configurations for this iMac so I can determine home much extra RAM I can upgrade to? And while I’m in there, what’s the longest lasting PRAM battery to install? Thanks. Ken kadjenter@yahoo.com

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Dan @danj 声誉积分: 479.6千 Self employed contract worker 35 329 971 · Answer 1 · 2020-10-26T19:27:13-07:00

The blade SSD is a cache drive, your OS is on you HDD. Sadly, the 24GB SSD is too small for a boot drive.

I would replace the blade SSD with something larger making it the boot drive holding your OS & apps. I would leave the HDD alone using it for your data drive. Basically setting up a dual drive config.

Here’s a good reference on Apples custom SSD’s The Ultimate Guide to Apple’s Proprietary SSDs you can go with an OWC drive besides the custom Apple units.

First thing is to make a clean backup of your system to be safe!

You'll need to break the Fusion Drive set follow this guide: Split Your Fusion Drive Apart

Then install your replacement blade SSD following this guide: iMac Intel 21.5" Retina 4K Display Blade SSD Replacement

Using Disk Utility format the new drive GUID Journaled file system and make sure you label the drive so you can tell the difference between the drives.

Now restart your system pressing Command (⌘)-R to enter into macOS Recovery About macOS Recovery Select your new drive to install a fresh copy of the OS your system is currently using.

At the completion of the OS install you will be asked if you have any user data to transfer to your new drive. You will want to move the user accounts and apps over.

Reference: Mac startup key combinations

How do you reconfigure programming to get the OS and apps on the SSD blade? — Kenneth Jackson

iMac Intel 21.5" Retina 4K Display 2015

Upgrading Fusion Drive to SSD, With added RAM - How and What Parts

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Update (10/27/2020)

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