Data corruption is the damage of data caused by various software or hardware fails. After a file gets damaged, it will no longer work accurately, so an app will not start or shall give errors, a text file could be partially or completely unreadable, an archive file will be impossible to open then unpack, etc. Silent data corruption is the process of data getting damaged without any acknowledgement by the system or an administrator, which makes it a significant problem for website hosting servers as fails are much more likely to happen on larger hard disk drives where vast volumes of information are kept. If a drive is a part of a RAID and the data on it is duplicated on other drives for redundancy, it is very likely that the damaged file will be treated as a good one and will be duplicated on all the drives, making the harm permanent. A huge number of the file systems that run on web servers these days often are unable to find corrupted files instantly or they need time-consuming system checks through which the server is not functioning.