To effectively use storage devices in an operating system, you must first create partitions. Partitions serve as logical divisions on a physical disk, allowing you to organize data, use different file systems, and meet specific security or performance needs. Understanding the difference between MBR and GPT is crucial for a system administrator, as is knowing how to manage them. This chapter will guide you through the essentials of disk partitioning, block device naming conventions, and the command-line tools used in RHEL to manage these layouts. We will also explore the powerful capabilities of Logical Volume Management (LVM), an abstraction layer that provides enhanced flexibility and control over your storage.