The ext4 file system on Linux systems is the successor to ext3 file system. As ext3 has been widely used for a long period of time, the ext4 file system is loaded with many new changes to overcome the limitations of the file system ext3. They were added to the ext4 file system some fundamental data structures offer better performance, new features and reliability, along with better design. This function is the delayed allocation feature, new data as it is entered to write. This allows the processor waits until the time when you really need to get the data on the disk and optimizes the writing process. However, sometimes it slows allocation function leads to severe data loss. The use of appropriate methods to resolve the situation is recommended. If you are unable to recover the lost data, then you need to use third-party Linux data recovery software to perform recovery ext4. Consider a scenario where you are using Ubuntu 9.04 with ext4 file system. There is a power failure and the system turns off suddenly. When power is restored, it was found that the files that are modified only appear for the NUL byte removal. Cause: The main cause of this problem is that due to the delayed allocation, when a file is written seen in the magazine. But it is not written to the disks to a distance of about 45 to 150 seconds. If you modify an existing file or create a new file so the changes are not implemented after power outage. Resolution: You can correct this absurd situation; you need to download the 2.6.30 version of the Linux kernel. You should be able to address the issue. However, there are chances that you may still be faced with the same problem, even after using the latest version. In these cases, a third party is required to use the recovery of Linux software to recover lost data files. These include the nature of overwrites existing data while scanning the disk read-only disk. Stellar Phoenix Linux Data Recovery is data recovery Linux software that lets you recover lost, deleted or formatted data from hard drives inaccessible. And ‘capable Linux restore data from multiple SATA hard disks as IDE, EIDE, etc. Apart from FAT12, FAT16, FAT32, this recovery tool Linux is able to perform the ext2 recovery, ext3 recovery and restoration ext4 ext4 file data recovery. This tool is compatible with various Linux distributions such as Red Hat, SUSE, Debian, Caldera, Mandrake, Sorcerer, TurboLinux, Slackware, Gentoo, etc. It is compatible with Windows 7, Vista, Server 2003, XP and 2000.