"We had some time to tinker with this latest and
greatest Linux, and it's my kind of Christmas present: solid
improvements to my favorite operating system. Here are the five
features that I think most of us will appreciate the most as we
move into the New Year.
The next step up in Linux file systems, has finally arrived. Ext4
improves, well, everything about hard drive storage. It gives you
larger file-system and file sizes, faster I/O, better journaling,
and it can defragment your drive on the fly."