Data corruption is the damage of info because of various hardware or software fails. After a file gets corrupted, it will no longer function accurately, so an application will not start or will give errors, a text file can be partially or entirely unreadable, an archive file 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, that makes it a significant problem for web hosting servers as fails are much more likely to occur on bigger hard disks where significant volumes of info are stored. When a drive is part of a RAID and the data on it is replicated on other drives for redundancy, it is very likely that the damaged file will be treated as an undamaged one and will be duplicated on all drives, making the harm permanent. Lots of the file systems that run on web servers nowadays often are not able to detect corrupted files instantly or they need time-consuming system checks during which the server is not operational.