different types of filesystems in linux (Ext2, Ext3 and Ext4)

EXT2: 

Ext2 was the standard file system for Linux until the introduction of ext3.

It was introduced with the 1.0 kernel in 1993.

Ext2 is flexible, can handle file system up to 4 TB.

EXT3:

Ext3- Extended 3 file system provides all the features of ext2, and also added feature of journaling and backward compatibility with ext2, we can also use the entire ext2 file system tuning, repair and recovery tools with ext3 also you can upgrade an ext2 file system to an ext3 file system without losing any of your data.

Ext3 supports 16 TB of maximum file system size and 2 TB of maximum file size.

EXT4:

Ext4 or fourth extended file-system is a journaling. Ext4 file-system released as stable file-system in Linux kernel version 2.6.28, it improved with better performance, reliability and other features.

Ext4have 1 EBof maximum file system size and 16 TB of maximum file size.

[EB/ Exabyte is 1018 bytes or 1,048,576 TB]

Features of ext4 file system:-

1. Bigger file system/file sizes.

2. Compatibility with ext2 and ext3.

3. Fast File system check - FSCK.

4. Online defragmentation. Etc.