Data corruption is the accidental change of a file or the loss of info that often occurs during reading or writing. The reason can be hardware or software failure, and because of this, a file could become partially or fully corrupted, so it'll no longer function correctly because its bits will be scrambled or missing. An image file, for instance, will no longer present a true image, but a random mix of colors, an archive will be impossible to unpack for the reason that its content will be unreadable, etc. When this kind of a problem occurs and it is not found by the system or by an admin, the data will be corrupted silently and if this happens on a drive that is part of a RAID array where the info is synchronized between different drives, the corrupted file shall be duplicated on all other drives and the harm will be permanent. A number of widespread file systems either do not offer real-time checks or do not have good ones which will detect a problem before the damage is done, so silent data corruption is a common matter on hosting servers where substantial volumes of data are stored.