QA output created by 139 Format and mount Create the original files CoW every other block Compare files 0 62 62 62 62 62 62 62 62 62 62 62 62 62 62 62 62 * 50000 0 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 * 50000