3TB Fusion Partitions

I have the 3TB FD, and although I haven't partitioned it, I can't see that it would slow you down. The system "learns" the applications that you use most, and places the load files on the SSD side in order to speed things up.

Others here have created partitions and will know more, but I'd say you'd be okay.

I'd say you'd not really see any performance gains and sticking with a single volume for your Fusion drive is what apple prefers.

akwilliams said:

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If i was to partition the drive so i have 500gb with the OS and other apps etc and then create a partition of 2.5Tb, will there be any degradation of performance?
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Performance can suffer for a few different reasons. One is that only one partition would be a fusion drives. The second is that having 2 partitions on a drive can create extra head movement slowing performance. And there are other rather minor performance hits.

And putting stuff on a second partition doesn't actually make the navigation easier. It fact it can make it more difficult as you would now have to not only look at the folders under your home folder, you also have to look at what's on the other partition. Especially if you saved a document (for instance) on the wrong partition.