Types of Blocks

Cylinder groups are divided into blocks to control and organize the structure of the files within the cylinder group. Each type of block has a specific function in the file system. A UFS file system has four types of addressable blocks and additional information management disk areas. The four types of blocks are:

• Boot block - Used to store information used when booting the system

• Superblock - Used to store much of the information about the file system

• Inode - Used to store all information about a file except its name

• Storage or data block - Used to store data for each file

See Chapter 32, File System Reference for more detailed information about each type of block.

If you want to customize a file system using arguments to the newfs command or with the mkfs command, see Chapter 32, File System Reference for information about altering these parameters.