+/* */
+/* The allocation is slightly confusing. A block can store up to 72 */
+/* chunks, which are allocated as needed when data is written. (Data does */
+/* not have to be written in order, but you should not try to read a byte */
+/* before writing it.) The size of a chunk is defined by ALLOC_CHUNK_SIZE. */
+/* So any block can store any amount of data, but you increase the limit */
+/* (for all blocks) by increasing ALLOC_CHUNK_SIZE, not the number of */
+/* chunks. */