Sustainable and cost-effective long-term archival storage remains an unsolved problem.  The most widely used enterprise storage technologies today are magnetic (hard disk drives and tape). They use media that degrades over time and have a limited lifetime, which leads to inefficient, wasteful, and costly solutions for long-lived data. This talk presents Silica: an archival digital data storage solution, designed starting from application of laser material processing, through multiple layers of abstraction, to address the needs of the modern archival workload.  Silica can support a wide range of archival storage workloads and ushers in a new era of sustainable, cost-effective storage.