Few things in computing are as vital as the lowly hard drive. If your memory goes bad or your processor blows, it's easy enough to switch out; when a hard drive gives up the ghost, your precious files expire along with it.All of which begs the question: Just how long do hard drives last?[ Managing backup infrastructure right is not so simple. InfoWorld's expert contributors show you how to get it right in this "Backup Infrastructure Deep Dive" PDF guide. ]