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Likely directory level corruption of the hard drive - meaning it needs to be reformatted to fix it (you would lose all the data). Back up the external, reformat, restore data and boot.
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ACMT
Mac mini (Mid 2011) 2.7 GHz i7, 8GB RAM, Crucial M4 256GB SSD + 500GB + 1TB FW800 OWC Mercury Elite Pro mini
iPhone 4S • iPod nano 8GB • Sound System Audio Engine A2 • Display UltraSharp U2412M 24"
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