Data corruption is the unintentional change of a file or the losing of information which usually occurs during reading or writing. The reason may be hardware or software failure, and due to this fact, a file can become partially or entirely corrupted, so it will no longer function as it should because its bits shall be scrambled or missing. An image file, for instance, will no longer display an authentic image, but a random combination of colors, an archive will be impossible to unpack since its content will be unreadable, etcetera. In case this kind of a problem appears and it's not recognized by the system or by an administrator, the data will become corrupted silently and if this happens on a drive that is a part of a RAID array where the information is synced between different drives, the corrupted file will be copied on all other drives and the damage will become long term. A large number of frequently used file systems either don't have real-time checks or do not have good ones that can detect a problem before the damage is done, so silent data corruption is a rather common matter on internet hosting servers where substantial volumes of info are stored.