In a 2007 study, CERN observed 1.53 million hard drives from 30 models over 32 months and analyzed the drive read errors returned. They noted that 3.5% of drives developed "latent read error" (i.e.
A 2007 study by CERN examined 1.53 million hard drives from 30 different models over a period of 32 months, analyzing the drive read errors they encountered. They discovered that 3.5% of these drives developed "latent read error."