Mahādhavalā the commentary on sixth section called Mahabandha has seven books.
One interesting fact about the Satkhandāgama is that it is believed that the 5 pada Namokāra Mantra is believed to have been composed by ācārya Pushpadanta as the mangalacarana (opening verse, often an invocation to god for the successful completion of the text) to the Satkhandāgama.