Unix File system
  wikipedia topics :
    Unix file system
    Inode
    EXT2 ( and other Linux filesystems )

Master Boot block (Master boot record, MBR) (Intel)

Volume boot block - lays out the structure of the partition.

  Located At beginning of the file system (partition).

  Contains code to continue boot sequence.

Partition Overview
  Each partition on a drive has:

  Boot block - Volume boot record.

  Super block - overall state of file system.
 
  Inode table - tracks individual files.
    Static table - maximum number of entry set when created.

  Data blocks - actual data storage units.

  Modern drives because of their size group cylinders together.
    Each group holds :
      Its own portion of the Inode table.
      Copy of the superblock (as backup)
      Free lists of blocks and inodes in the cylinder group.
      And next inode and block to use. 

  Unix treats everything as a file.
    There are inode entries for keyboard, display output, etc.