Data corruption is the damage of info caused by various software or hardware fails. After a file is damaged, it will no longer work correctly, so an app will not start or shall give errors, a text file will be partially or fully unreadable, an archive file will be impossible to open and then unpack, etc. Silent data corruption is the process of info getting harmed without any identification by the system or an administrator, that makes it a significant problem for website hosting servers as problems are much more likely to happen on larger hard disks where large volumes of info are located. In case a drive is part of a RAID and the info on it is replicated on other drives for redundancy, it is more than likely that the damaged file will be treated as a regular one and it'll be duplicated on all the drives, making the damage permanent. A huge number of the file systems which run on web servers these days often cannot recognize corrupted files immediately or they need time-consuming system checks through which the server isn't functioning.