/*
 *  linux/include/linux/ext2_fs.h
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card (card@masi.ibp.fr)
 * Laboratoire MASI - Institut Blaise Pascal
 * Universite Pierre et Marie Curie (Paris VI)
 *
 *  from
 *
 *  linux/include/linux/minix_fs.h
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */ 

..........................

 /*
 * The second extended file system version
 */ 
#define EXT2FS_DATE      "95 / 08 / 09 "
#define EXT2FS_VERSION      "0 .5b"

.........................

 /*
 * Macro-instructions used to manage several block sizes
 */ 
#define EXT2_MIN_BLOCK_SIZE       1024 
#define  EXT2_MAX_BLOCK_SIZE      4096 

[root@host root]# mkfs -t ext2 /dev/sda10
mke2fs  1 . 27  ( 8 -Mar- 2002 )
Filesystem label=
OS type: Linux
Block size= 1024  (log= 0 )
Fragment size= 1024  (log= 0 )
 26104  inodes,  104391  blocks
 5219  blocks ( 5 . 00 %) reserved for the super user
First data block= 1 
 13  block groups
 8192  blocks per group,  8192  fragments per group
 2008  inodes per group
Superblock backups stored on blocks: 
         8193 ,  24577 ,  40961 ,  57345 ,  73729 

Writing inode tables: done                            
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every  32  mounts or
 180  days, whichever comes first.  Use tune2fs -c or -i to override.

[root@host root]# mkfs -t ext2 -b  2048  /dev/sda11
mke2fs  1 . 27  ( 8 -Mar- 2002 )
Filesystem label=
OS type: Linux
Block size= 2048  (log= 1 )
Fragment size= 2048  (log= 1 )
 52304  inodes,  104406  blocks
 5220  blocks ( 5 . 00 %) reserved for the super user
First data block= 0 
 7  block groups
 16384  blocks per group,  16384  fragments per group
 7472  inodes per group
Superblock backups stored on blocks: 
         16384 ,  49152 ,  81920 

Writing inode tables: done                            
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every  23  mounts or
 180  days, whichever comes first.  Use tune2fs -c or -i to override.

[root@host root]# dumpe2fs /
dumpe2fs  1 . 27  ( 8 -Mar- 2002 )
dumpe2fs: Attempt to read block from filesystem resulted in short
read while tryingto open /
Couldn't find valid filesystem superblock.
[root@host root]# dumpe2fs /dev/sda1
dumpe2fs  1 . 27  ( 8 -Mar- 2002 )
Filesystem volume name:   /
Last mounted on:          <not available>
Filesystem UUID:          6cb3d196-d533-11d6- 9623 -ea9932f055c3
Filesystem magic number:  0xEF53
Filesystem revision #:     1  (dynamic)
Filesystem features:      filetype sparse_super
Filesystem state:         not clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:               127744 
Block count:               255024 
Reserved block count:      12751 
Free blocks:               50205 
Free inodes:               108730 
First block:               0 
Block size:                4096 
.................................