There are only two days left until the third Alpha version of the upcoming Ubuntu 9.04 (Jaunty Jackalope) will be available (for testing), and... we couldn't resist the temptation to take the current daily build for a test drive, before our usual screenshot tour, and taste the "sweetness" of that evolutionary EXT4 Linux filesystem. Announced on Christmas Eve, the EXT4 filesystem is now declared stable and it is distributed with version 2.6.28 of the Linux kernel and later. However, the good news is that the EXT4 filesystem was implemented in the upcoming Ubuntu 9.04 Alpha 3 a couple of days ago and it will be available in the Ubuntu Installer, if you choose manual partitioning (see the screenshot below for details). The bad news is that EXT4 will not be the default filesystem for the Ubuntu OS until version 9.10, due for release in late October this year.
OK, OK... so how will the end user benefit from this EXT4 filesystem? Well, first of all, the whole system will be much faster and more reliable compared to one with EXT3 (I guess that some of you still remember the Firefox/Ext3 issue), it will boot faster (the current article proves that) and it's able to handle files with sizes of up to 16 TB (terabytes). But these are just a few of the features brought by the fourth extended filesystem, for more details you can check the Wikipedia entry for EXT4.
Ubuntu 9.04 Boots in 21.4 Seconds - With EXT4 as the default filesystem. - Softpedia