Data corruption is the unintended transformation of a file or the loss of information that usually occurs during reading or writing. The reason may be hardware or software fail, and as a result, a file can become partially or entirely corrupted, so it will no longer work as it should as its bits will be scrambled or lost. An image file, for example, will no longer present an actual image, but a random combination of colors, an archive will be impossible to unpack as its content will be unreadable, and so on. If this kind of an issue appears and it's not found by the system or by an administrator, the data will be corrupted silently and when this happens on a disk drive that's part of a RAID array where the info is synced between various different drives, the corrupted file shall be replicated on all the other drives and the harm will be long term. A large number of commonly used file systems either don't feature real-time checks or do not have high quality ones which will detect a problem before the damage is done, so silent data corruption is a common matter on web hosting servers where huge volumes of information are stored.