sentences:  2009 study reported a 32% chance that a given computer in their study would suffer from at least one correctable error per year, and provided evidence that most such errors are intermittent hard rather than soft errors.A 2010 study at the University of Rochester also gave evidence that a substantial fraction of memory errors are intermittent hard errors.Large scale studies on non-ECC main memory in PCs and laptops suggest that undetected memory errors account for a substantial number of system failures