Data corruption is the damage of info caused by various hardware or software fails. After a file is damaged, it will no longer work properly, so an app will not start or shall give errors, a text file will be partially or fully unreadable, an archive file will be impossible to open and unpack, etc. Silent data corruption is the process of info getting damaged without any acknowledgement by the system or an administrator, that makes it a serious problem for hosting servers as fails are more likely to happen on larger hard drives where significant volumes of info are located. When a drive is a part of a RAID and the information on it is copied on other drives for redundancy, it's likely that the bad file will be treated as a regular one and it'll be copied on all of the drives, making the damage permanent. Lots of the file systems which operate on web servers nowadays often are not able to recognize corrupted files right away or they need time-consuming system checks during which the server isn't functioning.