Data corruption is the unintended change of a file or the loss of information which often occurs during reading or writing. The reason can be hardware or software malfunction, and consequently, a file could become partially or fully corrupted, so it will no longer function properly since its bits will be scrambled or lacking. An image file, for example, will no longer present a true image, but a random mix of colors, an archive will be impossible to unpack for the reason that its content will be unreadable, etcetera. In case this kind of an issue appears and it isn't recognized by the system or by an administrator, the data will get corrupted silently and if this happens on a disk drive which is part of a RAID array where the data is synced between various drives, the corrupted file will be replicated on all of the other drives and the damage will be long term. Numerous widely used file systems either do not offer real-time checks or don't have high quality ones which will detect an issue before the damage is done, so silent data corruption is a rather common problem on web hosting servers where substantial amounts of information are stored.