Back in January, we wrote a story about which company makes the most reliable hard drives. At the time, Hitachi came out ahead of Western Digital and Seagate by a significant margin. Now, with new data from our friends at Backblaze who have 34,881 hard drives spinning their little hearts out as you read this sentence, we're going to try and investigate the matter of why there's so much variation between the reliability of the big three hard drive makers.