Data corruption is the unintentional modification of a file or the loss of information that often occurs during reading or writing. The reason could be hardware or software failure, and as a result, a file may become partially or entirely corrupted, so it will no longer function properly as its bits shall be scrambled or missing. An image file, for instance, will no longer present a real image, but a random combination of colors, an archive will be impossible to unpack as its content will be unreadable, and so on. In the event that such a problem occurs and it is not found by the system or by an admin, the data will become corrupted silently and in case this happens on a disk drive which is part of a RAID array where the data is synchronized between various different drives, the corrupted file shall be copied on all the other drives and the damage will become permanent. Many commonly used file systems either don't have real-time checks or do not have high quality ones which can detect an issue before the damage is done, so silent data corruption is a rather common matter on internet hosting servers where substantial amounts of data are kept.