After 4+ years the 1TB HDD of the Fusion Drive of my 2012 27-inch iMac has failed. I knew my HDD was damaged as it clicks like mad and before I split the Fusion Drive I kept getting a Spinning Wait Cursor. When I split the logical drive into separate SSD and HDD I was able to install macOS on the SSD while the HD My working budget is restricted to $500 Option 1 - Replace Fusion Drive’s SSD & HDD with two 525GB Crucial MX300 with 3 year warranty - Reads and writes of 1,000MB/s respectively - Faster boot times and faster access to apps and data - Same storage size as my 1TB Fusion Drive but its really fast. - Chances of fan noise reduced to nil Option 2 - Keep the original Fusion Drive’s 128GB SSD and replace broken HDD with a 10TB Seagate HDD with 5 year warranty for a 10TB Fusion Drive - Reads & writes of between 250-400MB/s - 10TB Fusion Drive will be slightly faster than the original 1TB Fusion Drive with 10x more storage space. Option 3 - Do not open the iMac and keep the built-in 128GB SSD & buy an external HDD with Thunderbolt 2 or USB 3. - No more need to open things up and risk of damage. - Chance of fan noise reduced to nil I mostly use my iMac to edit 50MP images. If you were in my place which would you do?