mkdir directory
genfile --length 10240 --pattern zeros --file directory/file1
genfile --length 10240 --pattern default --file directory/file2
+touch -t 197001030000 directory directory/* # avoid subsecond resolution
-tar -H pax -cf archive directory || exit 1
+tar cf archive directory || exit 1
echo separator
tar uf archive directory || exit 1
echo separator