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For the Apple model MRT42LL/A (21.5-inch iMac with Retina 4K display, Early 2019), the standard internal hard drive operates at a speed of 5400 RPM. This applies to the traditional HDD, as well as the hard-drive portion of a Fusion Drive configuration. If the device is configured with a Fusion Drive, overall performance may feel faster due to the SSD component, but the mechanical hard drive itself still runs at 5400 RPM.
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