Data corruption is the damage of information caused by various software or hardware problems. After a file is corrupted, it will no longer function properly, so an app will not start or will give errors, a text file will be partially or completely unreadable, an archive file will be impossible to open and unpack, etc. Silent data corruption is the process of information getting harmed without any identification by the system or an admin, that makes it a serious problem for website hosting servers as failures are much more likely to happen on larger hard drives where substantial volumes of info are kept. In case a drive is a part of a RAID and the info on it is copied on other drives for redundancy, it is very likely that the damaged file will be treated as a standard one and it will be copied on all of the drives, making the damage permanent. A huge number of the file systems which run on web servers these days often cannot recognize corrupted files immediately or they need time-consuming system checks during which the server is not working.