This illustration shows six blocks of a file. Free List 1 and Free List 2 are stored in block 2, the Segment Header block. Free List 1 is partitioned to block 5, and Free List 2 is partitioned to block 6.

Instance X has two insertion points: one to Free List 1, and one to Free List 2.

Instance Y has two insertion points: one to Free List 1, and one to Free List 2.