Data corruption is the damage of data caused by various software or hardware problems. When a file is damaged, it will no longer function correctly, so an app will not start or shall give errors, a text file will be partially or completely unreadable, an archive will be impossible to open and then unpack, etc. Silent data corruption is the process of information getting damaged without any identification by the system or an admin, which makes it a serious problem for website hosting servers as problems are very likely to occur on bigger hard disks where large volumes of information are kept. In case a drive is a part of a RAID and the info on it is duplicated on other drives for redundancy, it is very likely that the damaged file will be treated as an undamaged one and it'll be duplicated on all of the drives, making the harm permanent. A lot of the file systems which run on web servers today often cannot recognize corrupted files in real time or they need time-consuming system checks through which the server is not functioning.