Data corruption is the unintended transformation of a file or the loss of info which often occurs during reading or writing. The reason can be hardware or software fail, and as a consequence, a file could become partially or entirely corrupted, so it will no longer work properly since its bits shall be scrambled or missing. An image file, for example, will no longer show an accurate image, but a random combination of colors, an archive will be impossible to unpack for the reason that its content will be unreadable, and so on. If such a problem occurs and it isn't found by the system or by an admin, the data will get corrupted silently and if this happens on a drive that is part of a RAID array where the data is synchronized between various different drives, the corrupted file shall be replicated on all the other drives and the damage will become long term. Numerous widely used file systems either don't offer real-time checks or don't have high quality ones which can detect an issue before the damage is done, so silent data corruption is a very common issue on hosting servers where large volumes of data are kept.