Data corruption is the damage of information due to various software or hardware failures. Once a file gets damaged, it will no longer work properly, so an app will not start or shall give errors, a text file will be partially or entirely unreadable, an archive will be impossible to open and unpack, etc. Silent data corruption is the process of info getting harmed without any identification by the system or an administrator, which makes it a significant problem for web hosting servers as problems are more likely to occur on larger in size hard drives where significant volumes of information are kept. In case a drive is a part of a RAID and the data on it is duplicated on other drives for redundancy, it's likely that the damaged file will be treated as a good one and will be copied on all drives, making the harm permanent. A huge number of the file systems which operate on web servers nowadays often cannot discover corrupted files in real time or they need time-consuming system checks through which the server isn't functioning.