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> Replace a dying Fusion Drive
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I’ve been using the 128GB SSD from my 2015 iMac’s broken Fusion Drive with El Capitan. Now it’s almost full of “hidden space”. How do I clear it?
When a Fusion Drive fails, it’s often possible to continue using that Mac with just the surviving one of its two component drives functioning — either the hard drive or SSD. However, that’s best used as a temporary measure until you can arrange a more lasting substitute startup disk. The SSDs in Fusion Drives are small, and by the time their paired hard drive has failed, they’re typically approaching the end of their own working lifespan.