This illustration depicts block media recovery. Block 13 is shown on a line depicting a series of database changes. At the beginning of the line, Block 13 is restored in datafile 4; the associated database change is change 100. At the next stage, change 120 is missing redo for block 13. At the next stage, block 13 is newed. Finally, change 160 records the last change for block 13. The recovery is explained in the following text.