Data corruption is the unintended transformation of a file or the loss of info that usually occurs during reading or writing. The reason could be hardware or software malfunction, and for that reason, a file can become partially or entirely corrupted, so it'll no longer work properly since its bits shall be scrambled or lacking. An image file, for instance, will no longer present a true image, but a random combination of colors, an archive will be impossible to unpack for the reason that its content will be unreadable, etc. In case this kind of an issue occurs and it's not found by the system or by an admin, the data will be corrupted silently and in case this happens on a disk drive that's a part of a RAID array where the data is synced between different drives, the corrupted file will be duplicated on all other drives and the harm will be long term. A number of widespread file systems either don't have real-time checks or don't have good ones that can detect a problem before the damage is done, so silent data corruption is a common problem on hosting servers where substantial volumes of data are kept.