Chosen Solution

I want to replace both the SSD blade and the HD with a single SSD drive in a late 2012 iMac 27”. Do I need to first split up the Fusion Drive or can I simply remove both SSD blade and HD and replace the HD with the SSD drive following the respective instructions? I do have a time machine backup. Reason: the SSD blade reports an error and I always wanted to upgrade the HD anyway.

To do it properly you need to break the fusion drive set before altering the drives. iMac Intel 27" EMC 2546 Hard Drive ReplacementiMac Intel 27" EMC 2546 Blade SSD Replacement