Four different sections
- The Reserved sectors, located at the very beginning. The first reserved sector is the Boot Sector. It includes an area called the BIOS Parameter Block (with some basic file system information, in particular its type, and pointers to the location of the other sections) and usually contains the operating system's boot loader code.
- The FAT Region. Maps of the Data Region, indicating which clusters are used by files and directories.
- The Root Directory Region. This is a Directory Table that stores information about the files and directories located in the root directory.
- The Data Region. This is where the actual file and directory data is stored and takes up most of the partition.