MBR Corruption in Linux and Data Recovery

MBR is to store of all the information required by the operating for the implementation of the booting process. This information is located at the first sector of the hard drive. The end of the MBR sector reveals the knowledge about the bootable partition. In Linux, the MBR is directly accessible through the dd command.

But unfortunately, a mere fault with this information can fetch some drastic mishaps to the data. The data may become inaccessible (as the booting of the system would not be succeeded) and the Linux data recovery need may step into the scenario.

This generally happens when this MBR gets overwritten. The chances of this phenomenon rises mainly when you are dual booting between Windows and Linux. However there are some situations when the overwriting or the corruption of MBR is observed like:

• Wrong use of dd: dd command can be used to restore MBR as:

# dd if=/path/mbr-backup of=/dev/hda bs=512 count=1

But the incorrect use may overwrite the existing MBR and may corrupt it.

• In the dual boot system and while working with Windows clicking on hibernate instead of shutdown may overwrite the existing MBR. The GRUB boot loader, which is the multiboot loader, then gets housed.

This is the major threat to your data and it may remain inaccessible until you apply the fixing mechanism for the damaged MBR or some Linux recovery utility. Linux Distribution CD may help you in this regard from which the booting of the system is required and some BIOS settings are required while the mere GRUB corruption can be cured with the following command:

# grub-install /dev/hda

Note: in case of SCSI hard disk the device node is /dev/sda instead of /dev/hda of IDE hard disk.

If the trouble is un-addressable by any of the fix, data recovery Linux is the way to go through third party application. These software have the inbuilt power to scan the hard drive thoroughly and to retrieve the information.

Stellar Phoenix Linux Data Recovery software works for all the data loss instances in the most effective and easy manner. Without letting you know any technical details about the data recovery Linux process, this software goes well with Ext2, Ext3 and Reiser FS file systems.

This Linux data recovery utility is applicable for all the Linux flavors. The File Filter and File Mask like options add to the advantages of this Linux recovery tool and software is viable for recovering each type of file.

SCSI CRC Booting Error in Linux

The booting errors are dangerous threat to the data kept in any of the operating system including Linux. Once the system shuts downs unexpectedly the risk of crucial issues and data threatening problems is always there. The most probable instance is when the system refuses to boot properly with some sort of error messages. In Linux operating system in similar conditions the user is found to report having some SCSI CRC error messages like:

Creating Root Device
mounting root filesystem
(scsi:0:0:0:0) CRC error during data-in phase
(scsi:0:0:0:0) CRC error in intermediate CRC packet
scsi: aborting command due to timeout: pid 0, scsi 0, channel 0, id 0, lun 0 read (10) ......

The trouble appears to be related to the hardware issues but actually its not. The problem could be any of the following:

• File system faults
• Corruption in the /boot directory
• Damage of initrd

/boot is the repository of all the information that is requires at the booting time while the initrd is the temporary one which is used for making any preparations prior to the real mounting can be done through root filesystem.
You can use the Rescue CD to come up the situation and restore the /boot directory. You can also try out the cloning of the disk and its diagnosing. But when none of the solution is practical Linux recovery is the serious issue to be tackled.

Linux data recovery is compulsory when the hard drive is the bundle of all the important data required from many angles either from business or personal. Linux recovery software can do this job very well which are needed to be installed on any healthy system and the affected hard drive is attached to this system.

These data recovery Linux utilities have the power to scan the hard drive effectively with the powerful algorithms and to retrieve the information intact. Empowered with the interactive user interface, these Linux recovery tools don’t make any changes to the actual data.

Linux data loss and SCM Failure

SCM or Service Control Manager serves the purpose of creating, deleting, starting and stopping the services in Linux supported servers. This acts as the single administration point for Linux managed nodes. The CMS or Central Manager Server looks for the entry of local host and the system name in the /etc/hosts file and some relevant functions.

But in few of the cases, the SCM doesn’t respond at all and fails to function. None of the corresponding error message gets appeared in the log file and hence you don’t have any clue of the problem.

But the problem can be detected for cause in the system viz. /var/log/messages log file by typing grep mx messages command. You may face the following problems:

· I/O Exception: If the mx.properties file is not readable then the I/O exception may be encountered. So the required permissions of the file are needed to be checked if the file exists and if the file doesn’t exists, then perhaps this has been deleted or moved. So look for it and move to the correct directory and if you can’t then probably it’s deleted and for curing the situation, CMS is needed to be reconfigured. But this is the weird situation for the data which may need Linux recovery.

· Distorted URL or Remote Exception: If RMI registry is not properly bounded, then this may occur. So for the fix, the proper functioning of mxagnet daemon is required.

· Vulnerabilities in mx.properties file: This file is relevant and if not found at the exact location or has been deleted then the corrective measures are needed to be taken.

The reconfiguration of CMS is the threat to the data, which may get lost during the process. In case you don’t have proper backup to restore the lost data, the situation can be devastating but fortunately this has a cure in terms of Linux recovery.

Data recovery Linux is feasible through Linux data recovery software which has the capability to restore the data after this has been deleted due to any cause. Offering intuitive user interface, these Linux data recovery products have the power to scan the hard drive systematically.

Stellar Phoenix Linux Data Recovery does the stunning job in recovering and restoring each bit of information from Ext2, Ext3 and Resier FS file systems. This Linux recovery tool recognizes each type of file and hence provides complete data recovery.

Empowered with the intuitive user interface, this data recovery Linux software doesn’t make any alteration to the data. Live Update, File Filter and File Mask are few of the options which make the working of the software more worth.

Data Loss while Installing Kubunto Linux

Every new file version of any operating system comes with a numerous features and functionality. Every user likes to take advantage of these advanced and new features and upgrade to the later versions.

One of such operating system file version is Kubunto 8.10 flavor of Linux operating system. It includes the KDE 4 desktop, high stability, better performance and several other advantages. It is the newest and trustable software in the open source community.

Sometimes, when you install Kubunto 8.10, you may lose your valuable data due to mistake. If you have two hard drives attached to your system during installation it will ask you the following question:

“Do you want to recognize RAID?”

By mistake if you answer this question to Yes you may face situation of data loss. Kubunto will make RAID of your two hard drives and thus will copy all the data of your hard drive 1 to hard drive 2.

As a result, when you attempt to your second hard drive you will get only the mirror image of your data stored on hard drive one. It will result into catastrophic loss of all your data from second hard drive.

It is the most critical situation in which a Linux user could face and may put him/her in need of data recovery Linux.

Note: The copying process of data from hard drive one to hard drive two might overwrite the existing data. But it is not essential that all the data will be overwritten. It might be possible that the previously allocated memory locations are not allocated to the new data. In this situation the data only from hard drive sectors which are not written in copying process can be recovered.

Linux data recovery software is powerful third party utilities, which allow users to have quick and successful Linux recovery in most of the logical data loss situations. To have efficient Linux data recovery it is extremely important to select powerful and reliable Linux recovery software.

Linux data recovery software is applicable with all flavors of Linux operating system including Kubunto. To get more information about Phoenix Linux Recovery download its free demo version and scan your hard drive with it. Demo version can be downloaded from Stellar’s website.

Vulnerabilities of using dd Command Incorrectly in Linux

The dd (data definition) command in Linux operating system provides many advantageous purposes like low-level copying of the data and converting raw data. The command is intended for copying the file system off and is able to copy the specified number of bytes or blocks of data. Additionally this permits to copy the data blocks backwards so that in any case of error in the block at any point, the data which is lying before and after the string will be copied.

The command is good tool in Linux data recovery. When the hard drive failure like incidents take place, the command is useful in creating the image of the volume in concern. On the new hard drive, a target partition is made having the same size as that of the failed one. Then the command is run to copy the data from the source partition

But a mere mistake during the process may fetch drastic results. Doing the low-level operations on the hard disk, if accidentally the parameters of ‘if’ and ‘of’ get reversed, then it may render whole of the disk unusable.

Also the block size to be copied must be considered. The conv=noerror, sync option, which is used in copying the data, ignores the remainder of the block and replaces with zero-bytes. So if the block size is large the complete Linux data recovery can’t be guaranteed. On the other hand, if you use small block sizes to copy, then process results to be time-consuming.

Data recovery Linux is worth through dd if the hard drive is not having the bad sectors as in the else case, the process is quite time-eating. Hence the benefits of attempting Linux recovery on a damaged region are limited.

So instead you can try other options to recover the data called Linux data recovery software which are valuable in any case of data loss. The Create Image feature, available with only few selected Linux recovery software, proves to be wonderful when the hard drive possess lots of bad sectors.

These data recovery Linux products perform a thorough scan of the affected hard drive with the influential algorithms and have no failure chances. The software are effective from the user’s point of view as no technical skills are demanded by these data recovery Linux software.

Stellar Phoenix Linux Data Recovery software is the superbly built software designed to search and recover the data effectively. This Linux recovery software uses the most powerful algorithms to avail Linux recovery from Ext2, Ext3 and Reiser FS file systems.

The software recognizes each file type and the RAW File Recovery and Create Image options are valuable in extensive damage scenarios. The software can end Linux recovery from all the Linux flavors.

Mistakenly Formatted in a Dual Boot System and Linux Recovery

A dual boot is a system in which two operating systems are installed on a single hard drive. You can boot from either of the operating system. The boot loader is a program which allows you to have dual booting.

General combination of operating systems exercised in dual booting includes Linux and Windows. The dual booting gives you to use features and functions of both of the operating systems on a single computer.

Although dual boot systems are very useful but sometimes they also cause a number of problems. A minor mistake made by the user while making a dual boot system can lead to the several major problems.

A common mistake made by the users while making a dual boot system is selecting “prepare hard drive” option. This option appears you when you install Windows operating system on a Linux system, in order to make it multi boot.

When you use this option, all of the hard drive partitions and stored data get deleted. After that new partitions are created and the operating system is installed. When the installation will complete, you will have a blank hard drive without any operating system and data. Everything, which was previously stored on the hard drive, will be deleted.

Data loss and hard drive partition loss is the worst case situation which a computer user could face. It can cause several nightmares and can possibly put you out of the business.

In such circumstances, it becomes really important to recover your precious data from the formatted hard drive to save you and your business. The data recovery in this case needs to be performed for the Linux data.

The data recovery Linux is possible through the use of Linux data recovery software. Linux recovery software is the application offered by the several data recovery companies, to handle all the data loss situations.

A powerful data recovery Linux software does a thorough scan of the hard drive and extracts data up to the maximum level of possibility.To ensure the absolute Linux data recovery selecting powerful Linux recovery software is important.