title: Ext2: Group Descriptors
body: <p>I'm writing a Java program to go through and navigate into a ext2 filesystem image. I know my fs is revision 1 (or greater), so I know that there are copies of superblock in groups 0,1 and those that are powers of 3,5 and 7. My question is, what happens to the group descriptor when in a group without a superblock? is there any? if there is, does that mean that it's in the first block of the group? Where should I look for the inode table in my third group?</p>
  
  <p>My fs has 3 groups (0,1,2), each 8192 blocks long with blocksize=1024.</p>