Hierarchical Storage Systems (HSS) are data storage solutions that organize information in a tiered structure. This system typically includes multiple storage types, such as hard drives, solid-state drives, and tape storage, each serving different performance and cost needs. Frequently accessed data is stored on faster, more expensive media, while less frequently accessed data is moved to slower, more economical options. The main goal of HSS is to optimize storage efficiency and cost-effectiveness. By automatically managing data placement based on usage patterns, HSS helps organizations maintain performance while reducing overall storage expenses. This approach is particularly beneficial for large data environments.