Data corruption is the damage of info caused by various hardware or software fails. When a file is corrupted, it will no longer work as it should, so an app will not start or will give errors, a text file shall be partially or completely unreadable, an archive 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 admin, which makes it a significant problem for web hosting servers as problems are more likely to happen on larger in size hard disk drives where considerable volumes of info are stored. In case a drive is part of a RAID and the data on it is duplicated on other drives for redundancy, it's more than likely that the bad file will be treated as a healthy one and will be copied on all drives, making the damage permanent. Lots of the file systems which operate on web servers nowadays often are not able to find corrupted files in real time or they need time-consuming system checks through which the server is not functioning.