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I have a MacBook Pro 13" (non-retina) from 2012 with a 512GB HDD. I've run some speed test with BlackMagic and those are around 75-80MB/sec for read/write. This seems slow, but maybe this is normal for this configuration.
Are these normal values?
Those kinds of speeds are to be expected from a MacBook HDD. For much higher speeds, consider upgrading the HDD to an SSD. (See Macbook Pro Hard drive speed)