Linux Data Recovery Software

Data Recovery means to recover lost data from corrupted deleted or damaged OS. As it is well known fact that, the chances  of losing data in Linux OS is very less. But sometimes human errors or software malfunction can cause data loss, and you fails to access your saved data from the file system of Linux operating systems. as your data get corrupted or lost. Now, to recover and restore the deleted or damaged data back, Linux Disk Recovery software is what is required.

To Recover Linux Data, data recovery software scan the whole hard drive and find out the missing files and folders. After finding lost data or folders or both the data recovery software rearrange them into hierarchical structure like the recovered files and folders can be easily searched out by the users. Extra efforts or technical skills are not required to work on the Stellar Phoenix Linux data recovery software. It is very user friendly. Now, the Linux data recover software with powerful algorithm and searching technique capable of recovering heavily damaged or deleted Linux files and folders.

Ext3 File system recovery From Linux partition

In  this e-age, we must have witnessed data loss every now and then. Though linux is not new to us, for its command mode and less user friendlier user interface, users are less comfortable at using it. Furthermore, if there happens any problem leading to data loss, the panic is beyond explanation. LINUX has some inbuilt commands for customizing the recovery of deleted files, still recovery from complex issues of data loss need more sophisticated utility like Linux partition recovery software.

Brief about ext3 file system:

Linux has many different file systems such as JFS, ReiserFS, XFS, ext2, ext3 etc. Here we are talking about ext3 file system and the recovery options once any file is deleted under this. ext3 or the third extended file system is an extended version of ext2 and is a journaled file system.

What happens when we delete a file in LINUX and recovery options:

When we delete any file, the block pointers corresponding to the file are marked unused in the block bitmap and marks the inode as "deleted", leaving the block pointers alone. In case of ext3 file systems, the block pointer is filled with ZERO and it seems impossible to recover. However, the information can be recovered from the journal file. That is, every time a file is accessed, the access time is changed and its inode is written to the disk along with some odd 31 other inodes in the same block. In this situation, a copy of that particular block is written into a journal and the block pointer carrying information about the deleted files can be recovered from that journal. Hence, by using any Linux data recovery utilities, we can recover  deleted ext3 file, following recovering the information from the journal.

The most important thing to remember in case of Linux file recovery is that any write action should be avoided in the particular partition/volume, where a delete action has been performed. Furthermore, you should not install operations like 'fdisk', as it can overwrite the deleted data from the partition.

"no such device "error In linux - How to recover Linux data now?

Even the Linux is still less used in comparison to Windows, it is known for its advanced and improved features. Almost everyday, you can witness a modification to improve your Linux version. With increased number of facilities, safe usage and better programming Linux is gaining popularity. However, with certain minor incompatibility issues with other leading applications of previous versions, resulting into data loss, may force you to think of something like Linux recovery.

Scenario:

You have an HP 6930p laptop with karmic 9.0 installed on a 250 GB Western Digital hard disk. Your system shows an error and does not boot further after recent update of the 'update manager'. The situation leads to data inaccessibility and need of a Linux recovery software arises. The error message that flashed on your screen may read as below:

"no such device: ba123456-7980-abcd-efghijklmnop

Failed to boot default entries

Press any key to continue "

Cause:

There is no stated reason for the above error so far. However, there lies certain problem with the UUID feature of the GRUB and this is one of the reflections. In a way, we can say that, there is some design related issues and the error comes in the form or the other, thereby.

Resolution:

In order to resolve the above error, follow the steps exactly the way it is:

1) Try to boot the system from karmic 9.10 CD

2) Press the key 'C' to enter the command line mode

3) Try to set 'sda1' as the 'root' and boot from it by writing at the command line as-

set root=(hd0,1)

linux /vmlinuz root=/dev/sda1 ro

initrd /initrd.img

boot

• Once, able to boot into the system, open /etc/default/grub by-

sudo gedit /etc/default/grub

• Then, disable the UUID function by -

GRUB_DISABLE_Linux_UUID=true

• Lastly, update Grub2 by wringing -

sudo update-grub

Most likely, the above steps will solve the issues, however, if failed, then you have to restore your data from the updated backup. Furthermore, if backup is not available, then to recover the inaccessible data, you need to take the help of any Linux recovery software.

These Linux Recovery utilities are developed with powerful scanning methods that can locate and recover your inaccessible data. And the best thing about these Linux recovery software is that they don't need any technical expertise.

Disk corruption in LILO results in inaccessible Linux system

When a Linux system starts up, the system is started with linux loader, which is a system file. After that the Basic Input/Output System section, after doing some tests, transfers the control to the Master Boot Record where the LILO is stored. One big plus of using it is that the booting process becomes real fast especially when stored in the MBR.

At times, the OS gets corrupt as it also involves modification in the MBR while booting, which may lead to inaccessible system. There are various workarounds to recover and restore your valuable data. If none of them is successful, then the best alternative is to use a third-party Linux  Drive  recovery software.

Let us take an example in which you start your Linux system but it fails to boot properly. The boot process displays 'LIL' on the screen.

Cause:
The reason behind this booting problem is that the descriptor table is damaged.
In a Linux system, the hard disk is parted into blocks and then into block groups. The information of these block groups is stored in a group block descriptor, which also acts as an index table for these tables.

Resolution:
In such situations, you can perform the following methods:

    1) Check the BIOS (Basic Input/Output System) and verify whether the disk parameters in the disk are correct or not.
    2) Try to format the partition again and install the LILO. However, that would mean that the data may get lost.
    3) Run the 'fsck' tool to mount the file system and to check and repair any corruption issues on the file system.
    4)  If the 'fsck' command fails, then perform a complete format of the hard disk.

Now, if the Linux system is still showing corruption systems and you do not have updated backup of the data, then the best solution to recover inaccessible data is to use a professional Linux data recovery software. These Linux drive recovery tools perform non-destructive scanning algorithms to recover data in few easy steps.

Recover Lost Files From Ext2-Based Linux System

Are you using a Linux system and are unable to locate some of your files after a power outage? If yes, then there are chances that you may have lost these files due to any random reason. There are few methods in Linux that you can use to recover these files. If these methods do not work, then the taking the services of a professional Linux data recovery tool is called for.

Taking a practical case in which you are working on a Linux system that has ext2 file system. Suddenly, there is a power outage and the system shuts down abruptly. When the power is restored, you switch on the system, only to find that you have lost some of the files.

Cause:

•      There could be the following reasons for such situation:

•     The system could be virus infected that could have caused the data loss.

•      There could be some bugs in the operating system version.

•      It could be possible that the logical drives may be accidentally deleted.

•       The partition table may have got corrupt or damaged.

Resolution:

There are few in-build tools that you can use to recover the lost files. But first of all, you should ensure that you unmount the file system from which the files have been lost. To recover the lost files, you can perform the following tools:

debugfs: This tool is very useful in bringing back the deleted files if it is already installed on your system. To do the recovery, you need to perform the following files:

Try the following command to invoke 'debugfs'

/sbin/debugfs device

where, 'device' is the file system

In the 'debugfs' prompt, enter the following command:

lsdel

The deleted files will be enlisted. From here, you can see the deleted files.

To write the data of the deleted file in a new file, enter the following command:

dump filename

Where, 'filename' is the name of the deleted file

Now, repeat this command to recover all the rest deleted files.

When done, type 'q' to exit 'debugfs' prompt.

E2undel: This tool is also used to recover deleted files, but it has better interface and provides more options while recovering the files. To recover the files, you have to provide the following command:

e2undel -d device -s path [-a] [-t]

Well, if even these tools are unable to recover the lost data then there is an urgent requirement to use a third-party ext2 recovery software to restore deleted files. With use of advanced scanning algorithms, these tools ensure that Linux recovery is safe and secure.

How to deal with MBR corruption in linux

aster Boot Record  is known as the partition sector, that is the first 512-byte boot sector of a partitioned hard disk. MBR holds the primary partition table of the hard disk and your Linux system boots only after the BIOS passes the execution of the machine code inside the Master Boot Record. Hence, any problem with the Master Boot Record directly affects the booting process of the hard disk, making it inaccessible and the situation demands Linux data recovery techniques to bring back your valuable data.

The MBR is not reside in partition of the hard disk, it is there in the main boot boot record, ahead of the first partition. If a hard disk has been partitioned with the Master Boot Record partition table scheme, the Master Boot Record contains the primary partition entries in its partition table that is all the information required by the OS to boot up. Where, the first sector stores this, the last end sector stores the information about the bootable partition.

In LINUX, the Master Boot Record can be accessed through the command 'dd'. This functionality usually helps in taking backup of your data, restoration of the data and erasing the partition table. Hence, the command is very much helpful and give you certain amount of control over these things. However, these processes may sometimes overwrite or corrupt the MBR and to recover your inaccessible data you wonder for a good Linux recovery software.

These cases are a sure possibility in case of the dual boot systems, however, due to human errors, viruses, power fluctuation or any hardware/software malfunction can lead to MBR corruption.

In case of a MBR damage or corruption, you have to take one of the following alternatives:

1) Replace the MBR with a Disk Editor.
2) Replace the MBR with the Recovery Console.

If the above measures fail, try to copy the MBR from another drive, however it seldom matches to the existing partition scheme of the original MBR.

If all the above measures fail to resolve the MBR corruption issue and you don't have backup of your data, then, Linux data recovery is the only available alternative. These Linux data recovery softwares are powerful enough to recover your data from the drive irrespective of the data loss situation and are dam easy to use.

Linux error and recovery "Partition Table unreadable "

The partition is  considered as a piece of logical division of the disk space, which runs on some operating system. Partition table is located at the first sector (cylinder 0, head 0 and sector 1, MBR) of each hard disk and It memorizes the information about sizes and locations of partitions. Hence, any corruption to the partition table, may lead to serious data loss or inaccessibility, demanding Linux recovery technology to get back your valuable data.

Scenario:

You started your Linux system and suddenly your system halted with an error message popping up. All your data in the hard drive becomes inaccessible and you are getting the same error message, every time you boot your PC. The situation has left you with no other option  except something like Linux data recovery to get your data back. The error message flashing on your screen may read as follows:

“The partition table on device was unreadable”

Cause:
The primary cause behind the above mentioned error is that the partition table may be corrupt or damaged. Whereas, partition table gets corrupted due to any of the following reasons: unexpected shutdown, erroneous use of disk partitioning utilities, partition resizing,  improper use of terminal commands etc.

Resolution:
In order to resolve the above error, check out the following steps:

Try to check whether at least one of the partitions has been marked as active or not. If not, then mark the partition as active, in which the operating system has been installed and you want to boot from it.
If booting from any other partition in your system or by any other means, you can get into the system, then, immediately backup all the important data.
If the above means don't satisfy the purpose of resolving the error,try to delete the existing partition using the 'fdisk' command or any other partition utility and recreate the partition.

Repartitioning the hard disk erases all the previously stored data and to restore the data you need the latest backup. The stress increases, if the backup is not available or due to any unsolvable reason, failed to restore the data. This is a kind of situation that badly requires any good Linux recovery software to retrieve and restore your data.

These Linux Partition Recovery utilities incorporate advanced scanning mechanisms that dig into your formatted hard drive and recover the data without any further damage. Moreover, these applications don't need any expertise and in fact with instructions for each step, these are quite easy to use.