This guide serves as a comprehensive resource for CEOs, CTOs, CFOs, and business leaders seeking to understand block data storage solutions. It outlines a pragmatic process for selecting primary shared block data storage, emphasizing the need for IT leaders to control operational costs while ensuring data value aligns with storage expenses. The document details essential considerations for evaluating storage systems, including capacity requirements, workload performance, and compliance with regulations such as HIPAA and GDPR. It also discusses the importance of assessing internal IT knowledge and skills, budget considerations beyond just price per terabyte, and the implications of shadow IT. The guide aims to educate readers on the differences between block, file, and object data storage, debunk common myths, and provide a straightforward methodology for calculating total cost of ownership (TCO) for storage systems. By focusing on block data storage, the guide addresses specific capabilities and features that are crucial for effective data management.