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Unfortunately, Apple has left no room for a second 2.5-inch drive in Mac mini (built in 2014) and protects the contents with TR security screws with a security pin. Therefore, data can be accessed almost without delay. In contrast to a conventional hard disk, an SSD (solid-state drive) does not have magnetic disks with a mechanical read head, but stores the data on chips. If you have a current Mac mini without Fusion Drive, at home, the lame hard drive should be replaced by an SSD. Apple has been using slow hard drives in Mac mini for years, so replacing them with an SSD is very worthwhile.
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