オリジナル投稿者： Dan ,
The problem you face here is there is only two drive ports one for the HD the other the for the optical drive. As for the hard drive's size I do want to correct you as you stated 2.5", in fact your systems drive is a 3.5". To your points: 1 - True your drive is getting old so it is likely to fail 2 - True a Fusion drive can be faster than a hybrid drive in some cases. In other cases not so much. But jumping to a Fusion drive setup is not the only thing you can do to speed up a system. Often the amount of RAM can improve things as well as good drive file management. As you have an older iMac I do question how much investment in upgrading is wise here. Given the drives size I'm sure you have it mostly filled. I do recommend leaving 1/4 to 1/3 of the drive free that way the OS has some room to do its thing. So I would start there but I think going with a desktop class (3.5") hybrid drive (SSHD) will be a better investment than taking out the optical drive. I would also upgrade the RAM as well here either go up to 4GB or if your system can do it 6 GB. You will need to upgrade your systems firmware. Follow this Apple T/N: [https://support.apple.com/en-us/HT201518|EFI and SMC firmware updates for Intel-based Macs]. Doing theses two upgrades should give you at least two more years. Then you'll need to think about getting a newer system (which could be a used system).