What does the Master Boot Record (MBR) primarily store?

The Master Boot Record (MBR) primarily stores information about all partitions on the device, making it essential for the system to manage and locate different partitions on the hard drive. It contains a partition table that provides details on the layout of the disk, including where each partition begins and ends, as well as the type of file system each partition uses. This capability is critical for the operating system to access the data stored in various partitions efficiently.

Additionally, the MBR includes a small piece of executable code known as the boot loader, which is responsible for loading the operating system. While it does contain boot loader information, its primary function is broader, focusing on providing an overview of all partitions rather than just loading the OS. The other choices do not encompass the complete role of the MBR, which is to facilitate booting and partition management on devices that use this traditional partitioning scheme.