[Trae Johnson]

That is an excellent summary of data storage hierarchy and how each level is actually used. I like how you correlated the speed, volatility, and expense trade-offs in primary, secondary, and archive storage—it accurately shows why one level cannot be used to do it all. You also made a good point about networked and cloud storage extending those traditional tiers. The flexibility of NAS, SAN, and especially cloud object storage has really changed how organizations manage scalability and disaster recovery. I’d add that many modern systems now use automated tiering, which moves data between these levels based on access patterns—keeping “hot” data on SSDs and “cold” data on cheaper archival media.