Hello @MightyD Thank you posting on the Micro Center Community! I see you are going with a very high end build. What are your goals with this build? The Corsair 1000D fits 5 3.5'' and 6 2.5'' Drives, but keep in mind your motherboard has 8 SATA ports and will only connect 2 Drives if you connect your 2 M.2 Drives. I do think you only need 1-2 SSDs and the rest can be on HDDs. The main reason you want to use SSDs as secondary drives is if you need the high Read and Write speeds from it, usually seen in video editing.
If you're intending to use this system for gaming I'd recommend not using the Threadripper as it is more suited to multicore workloads and while it can game, it will not perform as well as a general desktop processor. The new Ryzen 5000 series CPUs are really shining in this category right now. I'd recommend selecting one of those. Generally, the selections you've made for this build are bit overkill for gaming alone. If you have the budget for it, you could definitely use SSDs, however, data is much cheaper on HDD. The reduction in cost does come at a loss of speed. Hope this helps.
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