How do I get the Seagate 2tb to do all the imovie editing and rendering and all the work and the ssd to to boot? anyway to change this and not wear out my ssd my seagate is just spinning and don't do anything and my ssd is s 128gb and its not even full.
iMac, macOS High Sierra (10.13.1)
You do not have any direct control over how the Fusion Drive operates. If you want to decide what goes where then you need to break the Fusion Drive and treat the SSD and HDD separately. If you choose this option then be sure you have a large enough SSD - minimally 128GBs. After you learn how to break a Fusion Drive it would be a good idea to learn how to get it back.
Splitting Your Data- An Alternative to Fusion | Other World Computing Blog
How to fix a split Fusion Drive - Apple Support
How to use an SSD with your HDD
If you are going to use an SSD as a boot drive together with your existing HDD as the "data" drive, here's what you can do.
After installing the SSD you will need to partition and format the SSD using Disk Utility. Then, install OS X on the SSD. After OS X has been installed boot from the SSD. Use Startup Disk preferences to set the SSD as the startup volume.
Open Users & Groups preferences. Click on the lock icon and authenticate. CTRL- or RIGHT-click on your user account listing in the sidebar and select Advanced Options from the context menu. You will see a field labeled "Home dir:" At the right end you will see a Change button. Click on it. In the file dialog locate the Home folder now located on the HDD (HDD/Users/account_name/.) Select the folder, click on Open button. Restart the computer as directed. When the computer boots up it will now be using the Home folder located on the HDD.
Another more technical method involving the Terminal and aliases is discussed in depth here: Using OS X with an SSD plus HDD setup - Matt Gemmell. This is my preferred approach because I can select which of the Home's folders I want on the HDD and which I don't want. For example, I like to keep the Documents and Library folders on the SSD because I access their content frequently.
Be sure you retain the fully bootable system on your HDD in case you ever need it.
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SSD Boot Drive And Seagate HDD
