Data corruption is the damage of info because of various software or hardware failures. Once a file gets corrupted, it will no longer work properly, so an application will not start or will give errors, a text file could be partially or completely unreadable, an archive will be impossible to open then unpack, etc. Silent data corruption is the process of information getting harmed without any acknowledgement by the system or an admin, which makes it a serious problem for hosting servers as problems are more likely to occur on larger in size hard drives where large volumes of info are located. If a drive is part of a RAID and the info on it is duplicated on other drives for redundancy, it is likely that the damaged file will be treated as an undamaged one and will be copied on all of the drives, making the damage permanent. A huge number of the file systems which run on web servers today often cannot detect corrupted files instantly or they need time-consuming system checks during which the server isn't operational.