Understanding EXT4: Timestamps, Extent Trees, Deletion

Nice blog posts:

• Understanding EXT4 (Part 2): Timestamps
  http://computer-forensics.sans.org/blog/2011/03/14/digital-forensics-understanding-ext4-part-2-timestamps
• Understanding EXT4 (Part 3): Extent Trees
  http://computer-forensics.sans.org/blog/2011/03/28/digital-forensics-understanding-ext4-part-3-extent-trees
• Understanding EXT4 (Part 4): Demolition Derby
  http://computer-forensics.sans.org/blog/2011/04/08/understanding-ext4-part-4-demolition-derby