Parity updates are performed in an efficient manner after data is modified on removable media in a RAID or RAIL array, within or outside the array, without requiring that all of the data on all of media in a parity group be read. Instead, a list is maintained identifying those blocks of data were which...http://www.google.fr/patents/US5864655?utm_source=gb-gplus-shareBrevet US5864655 - Managing removable media in raid and rail environments
Managing removable media in raid and rail environments
