Data corruption is the damage of data caused by various hardware or software fails. When a file is corrupted, it will no longer work accurately, so an app will not start or will give errors, a text file could be partially or completely unreadable, an archive file will be impossible to open then unpack, etc. Silent data corruption is the process of info getting harmed without any identification by the system or an admin, that makes it a serious problem for website hosting servers as problems are very likely to happen on bigger hard drives where vast volumes of info are kept. In case a drive is part of a RAID and the info on it is copied on other drives for redundancy, it is very likely that the damaged file will be treated as a good one and it'll be copied on all of the drives, making the harm permanent. A huge number of the file systems that operate on web servers nowadays often cannot locate corrupted files right away or they need time-consuming system checks during which the server is not functioning.