February 07 2011

Boot Block Corruption Causes Data Loss in Linux

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The Linux hard drive is partitioned in various partitions/volumes for effective management of your valuable data. Linux hard drive volumes start from the boot block where boot information of the operating system is stored. Last two byes of the Linux boot block contains boot block signature. In some cases, operating system cannot locate boot block signature and the disk cannot be accessed. It makes your significant data inaccessible and leads to data loss. Such cases require you to either restore data from backup or use Linux data recovery software to scan the drive and extract data from it.

For example, you might encounter an error message similar to the following one when you attempt to boot a Linux operating system based computer-

“Master boot record on /dev/hda has been updated.”
Subsequent to the above error, you may also encounter further error message that states-
“No boot signature found on partition”

The system cannot be booted in such cases and you face severe data loss situations. To recover your business-critical data in such cases, you are required to opt for Linux recovery tools.

Grounds of the issue

This problem most frequently occurs if you overwrite the LILO (Linux Loader) boot loader with the MBR (Master Boot Record) that was primarily installed on the /dev/hda disk volume. The boot loader might be overwritten if you try to install it using -M switch. Boot block corruption also results into the same problem.
How to fix boot block corruption problem?
In order to work around this problem, you have to overwrite the Master Boot Record with Linux Loader. It is possible with the help of /sbin/lilo Linux command. This command enables the operating system to overwrite MBR information on the /dev/hdX disk. Alternatively you can use LILO on the /dev/hda2 disk as:

boot=/dev/hda2
lilo -b /dev/hda2
lilo -M /dev/hda
lilo -A /dev/hda 2

In case the above method does not work, you will have to reinstall operating system. As reinstalling the operating system removes all the data from Linux partition, you will need data recovery Linux methods to get your precious data back. Linux data recovery software employs highly-advanced Ext2 recovery algorithms to ensure absolute recovery. The advanced Ext3 recovery software are absolutely safe to use with read-only Linux recovery conduct.

September 03 2010

?/etc/init.d/rc exited outside the expected code flow? Linux Error

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The final step of Linux boot process is init process, which starts a system process defined in /etc/ initab file. init config file then directs the init process and the shell script /etc/rc.d/rc.sysinit runs. Linux distros put some startup scripts in rc subdirectories, particularly at /etc/rc.d to take control of the services required to be started at boot. But sometimes, you find errors while this process and your system fails to boot. In such situations, you might need to reformat and reinstall the system. Consequently, you require your recent data backup to restore missing information. But if backup exists in unclean state or is currently not present, use of Linux Data Recovery applications can get your lost data back.

You might receive the similar error message while trying to boot your Linux based system:

“/etc/init.d/rc exited outside the expected code flow.

init:rcS main process <number> terminated with status <status>”

You cannot boot the system after this error message.

Cause

Init scripts are located at /etc/init.d/ directory. The above error message occurs if these scripts fail to load and start. It might occur if some of the init.d scripts are corrupted or damaged. As a result, services don’t start and your system fails to boot.

Solution

To solve the existing issue, you should try any of these methods:

• You can boot the system using Live CD and recreate the damaged files using gedit. gedit is the text editor developed for GNOME desktop environment. It is a UTF-8 compatible text editor.

• Try booting the system with Live CD and replacing the damaged script file

• If the above measures fail to correct the problem, you should reformat and reinstall the operating system. After this, you need to use your recent data backup to restore lost information.

While restoring data from backup, if you find any errors or it proves to be incomplete, you should use Linux Recovery applications. These are advanced tools built with indigenous technology to locate the missing information on disk and finally restore it. You find such Linux Data Recovery products with graphically rich user interface.

Stellar Phoenix Linux Data Recovery is an advanced tool to recover lost data from Ext2, Ext3 and ReiserFS based drives. It is a read-only application with high-end scanning algorithms and self-descriptive interface. It supports safe Data Recovery Linux for all of the Linux distributions like SUSE, Gentoo, Mandrake, Debian and more.

Allen a student of Mass Communication doing research on data recovery software. He is also a freelancer for http://www.stellarinfo.com

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