Data corruption is the unintentional modification of a file or the losing of info that often occurs during reading or writing. The reason could be hardware or software fail, and because of this, a file could become partially or completely corrupted, so it will no longer function as it should since its bits shall be scrambled or lacking. An image file, for example, will no longer display a true image, but a random combination of colors, an archive will be impossible to unpack because its content will be unreadable, etcetera. In case such a problem occurs and it is not noticed by the system or by an administrator, the data will get corrupted silently and if this happens on a drive that is a part of a RAID array where the data is synced between various different drives, the corrupted file will be reproduced on all the other drives and the harm will become long term. A number of frequently used file systems either do not have real-time checks or don't have good ones which will detect a problem before the damage is done, so silent data corruption is a common problem on internet hosting servers where large amounts of info are stored.