I think this is an early warning that your hard drive is showing errors. Your computer system has a utility that runs at boot up that checks the integrity of your disc and gives you a warning. DO BACKUPS in case it fails suddenly!
Best Black Friday Deals 2017
Black Friday Deals for Designers & Artists: Adobe, Apple, Corel Painter, Microsoft Surface, Wacom &e…
Best Black Friday Apple Deals 2017
Black Friday 2017 : date, sites participants & bonnes affaires