Data corruption is the damage of data because of various software or hardware fails. The moment a file is corrupted, it will no longer work accurately, so an application will not start or shall give errors, a text file can be partially or entirely unreadable, an archive will be impossible to open then unpack, etc. Silent data corruption is the process of data getting harmed without any acknowledgement by the system or an administrator, that makes it a serious problem for website hosting servers as problems are much more likely to occur on larger in size hard disks where significant volumes of information are placed. In case a drive is a part of a RAID and the data on it is replicated on other drives for redundancy, it's likely that the damaged file will be treated as an undamaged one and it'll be duplicated on all drives, making the harm permanent. Lots of the file systems that operate on web servers today often are unable to discover corrupted files in real time or they need time-consuming system checks during which the server is not operational.