Data corruption is the unintended transformation of a file or the loss of info that often occurs during reading or writing. The reason could be hardware or software failure, and as a consequence, a file can become partially or completely corrupted, so it will no longer work properly as its bits shall be scrambled or missing. An image file, for example, will no longer display a true image, but a random combination of colors, an archive will be impossible to unpack since its content will be unreadable, etcetera. In case such a problem occurs and it isn't found by the system or by an admin, the data will become corrupted silently and if this happens on a drive that is part of a RAID array where the information is synchronized between different drives, the corrupted file shall be duplicated on all the other drives and the damage will be permanent. A number of frequently used file systems either do not feature real-time checks or don't have high quality ones which will detect a problem before the damage is done, so silent data corruption is a rather common matter on hosting servers where substantial volumes of data are stored.