The Fusion Drive combines data on an SSD and hard drive, so the loss of either is a huge problem.
SSDs (solid-state drives) offer extremely reliable, fast, and consistent performance over many, many years. They aren’t subject to problems that can harm even the best-designed modern hard disk drives (HDDs): exposure to magnetic fields or the failure of moving parts inside the drives.
But SSDs remain expensive many years after they first appeared. Nearly all other aspects of computation—from processors to RAM to LCD displays—have dropped dramatically in price while improving in quality and performance year after and year.
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https://www.macworld.com/article/3326532/macs/fusion-drive-pitfalls.html
