Advanced Linux Data Recovery Software

When any volume of your LINUX hard drive contains unnecessary data, which you do not want any more, you format it and store data afresh. Sometimes, due to operating system malfunction, file system corruption or any virus/malware infection, volumes get corrupted and cannot be accessed. In such cases, you need to format the troubled partitions/volumes, so that data can be stored and accessed normally. This is case, when you have to format the volume forcefully, which results in the loss of valuable data in the formatted partition. Apart from these, there are occasions, when you lose all your data because of any accidental formatting. In any such occasion, if you still want to recover your data back, you need to take the help of any Linux data recovery software.

The act of formatting is similar to deletion of data. In both these operations (Deletion and Formatting), the data from their location get removed and we fail to access them with any normal means. In case of deletion, the operating system simply removes the data from its source location, whereas in case of formatting, the data as well as the structure of the volume are removed by the OS. In both the cases, the operating system removes all entries of the deleted data and marks the memory location as free so that new data can be stored at the same location.

In this context, the interesting thing is that the operating system never completely erases the deleted or formatted data from the hard drive and even after such an operation, your seemingly lost data are very much present at their locations. If the lost or removed entries of the deleted/formatted data can be retrieved, then the data can be easily restored.

LINUX recovery software are developed with innovative techniques to find out the lost entries of files due to deletion or formatting of them. These utilities are efficient enough to read those lost entries and recover the files back. Moreover they are designed with completely read only approach and retrieve data in their original format, without any damage/modification neither to the data nor to the storage architecture of the drive.

Lost your Important Files in Linux?

Researches say that out of the many different reasons of data deletion, the most common cause is human mistake. Sometimes, it happens accidentally, whereas some other time, it is intentional. You were deleting some unwanted copies of photos, when mistakenly deleted the only copy of a memorable photograph. Similarly, you just deleted a folder and only after the deletion, realized that there was one important financial document in that deleted folder, which you need badly. While working on your LINUX system, such instances are not so uncommon and users do encounter them quite often. But, don’t worry! Even after such critical cases of data loss, you can still recover your data by using any good Linux data recovery software.

There are various instances of data deletion, including accidental deletion, intentional deletion of data or sabotage, deletion by virus attack etc. In earlier time, it was believed that once you deleted a data from the system, the data goes for ever and it can never be retrieved. But, one interesting truth regarding this myth is that recovery of a deleted piece of data is quite possible.

So, the question is what happens to the data that you deleted and how it can be recovered back? When you deleted a file from your LINUX system, the operating system removed all its entries from the system hard drive and marked the memory, allocated to the deleted data as free. But, remember that LINUX does not erase or overwrite the deleted data, until you save new files onto the same disk. Hence, if by any technique you can find out the removed entries of the deleted data and read them, the data can be recovered.

The LINUX recovery software do exactly the same. These software are developed with highly advanced scanning algorithms. When you run the software, these scanning algorithms dig your hard drive/volume in all possible ways and read the lost/removed entries. By using those lost entries, the software recovers the deleted or formatted data back.

These Linux data recovery software are absolutely read-only in their operations and never alter the structure or format of the data in the drive. Moreover, the utilities are developed with such user friendly user interfaces that they can be used by professional programmers as well as non-technical home users.

How to Recover Data after Encountering Error – GRUB 17

Error – GRUB 17: Recover data

The Grand Unified Bootloader or GRUB is a package from GNU that facilitates implementation of multi-boot operation. With GRUB, you can install more than one operating system on your LINUX based computer and have their benefits. GRUB also facilitates viewing various hard drive partitions, repartitioning, modifying partition settings etc. However, sometimes it flashes error messages indicating problems in the hard drive, following which all the data in the data become inaccessible. In such situations, you can execute any data recovery LINUX utility to recover the seemingly lost or inaccessible data back.

You tried to boot your LINUX system and the system became inaccessible after displaying a GRUB error message. The error message, you may have encountered can be read as -

“GRUB Error 17: Cannot mount selected partition”

There can be a number of possible reasons behind the occurrence of the above error message, such as:

Though the requested volume/partition exists, but GRUB fails to recognize the file system.
The boot device set in the file '/etc/fstab' is incorrect.

Note: '/etc/fstab' stores information regarding connected disks as well as their partitions and provides the same to the system, when any drive is mounted.

GRUB has tried to boot a partition with severe corruption or damage to the file system.

Solution:
The following work around may help you resolve the above issues:
If the file '/etc/fstab' has been found with incorrect boot partition, try to edit and provide the correct boot partition.
If the file system has been found to be damaged or corrupted, run the 'fsck' command-line utility to locate and fix the errors.

If both the above option fails to solve the problem, you need to format the drive and make fresh partitions. With partitioning, all your data in the drive gets lost and you have to restore them from an updated backup. In case, you do not have a valid backup, you can still retrieve the formatted data by running any LINUX data recovery software.

These linux data recovery software incorporates many advanced techniques to read the lost entries of the formatted files and successfully recover them back. These software are extremely read-only in nature and with interactive user interfaces, quite easy to use.

Discussing a particular case of Superblock corruption in Linux

Linux offers you a multi-platform, secure environment suitable for the entire open enterprise and providing features to help you excel in every aspect of competition. It offers a centralized administration to help you manage and make the best possible use of the Linux technology. When it comes to security, Linux is the most widely-accepted operating system because of its top-of-the-line security features. Despite having a range of user-specific benefits, using Linux has a few drawbacks. The Linux file system is often subject to damage or corruption due to various reasons, such as virus infection, hardware malfunction, operating system bugs, etc. As a consequence, the valuable data present on the hard drive becomes inaccessible. To overcome this problem, you need to go for Linux recovery through a reliable third-party utility.     

For instance, you may come across the following error while working using your Linux-based system:

“suse:/# chown -v ryan:ryan /mnt/hdc1
failed to change ownership of `/mnt/hdc1' to ryan:ryan
chown: changing ownership of `/mnt/hdc1': Operation not permitted
suse:/# chmod -v 777 /mnt/hdc1
mode of `/mnt/hdc1' changed to 0777 (rwxrwxrwx)
suse:/# ls -l /mnt/
total 16
drwxr-xr-x 4 root root 16384 1969-12-31 17:00 hdc1
suse:/#”

Causes:
One of the following reasons might be responsible for the above error:
Due to incorrect directory or file attributes, you are unable to change the permissions.
The root directory is damaged, making the disk structure unreadable.
The superblock in the underlying file system is corrupt.

Resolution:
You need to try the following steps to resolve the issue: 

Use the below given command to edit your user ID from the terminal as follows:
 sudo gedit /etc/fstab
In the 'options' section,  provide the following values
umask= 0000
uid= your UID value
gid= your GID value
Now, save the file and exit.
Execute the following command from the terminal
 'sudo umount -a'
Run the command 'sudo mount -a' from the terminal.

If the problem still persists, you should take help of a proficient data recovery Linux utility. These third-party tools carry out an in-depth scan of your hard drive to retrieve all lost, deleted, or inaccessible data without affecting its integrity and other important characteristics. They have a simple, interactive interface design to make recovery easy and facile for the end users. Moreover, they support all mainstream Linux distributions, including Red Hat, SUSE, Debian, Caldera, Mandrake, etc.

Explaining a case of kernel panic in Linux 4 system

While trying to boot your Linux 4 system, you might have seen this on your screen:

“ext2fs partition type 0x83. ....ext3-fs: journal inode is deleted....
mount: error 22 mounting ext3 error 2 mounting name switchroot:
mountfailed:22 umount/initrd/dev failed:2 kernel panic - not syncing.”

This error indicates that somehow the beginning of the hard disk has become corrupt. The inode table contains some bad blocks that also include an ext3 journal file’s inode. Although, it is not certain but seems as if the root file system is non-recoverable. If you have a map, you can easily find out other copies of the inode table on the disk. In case the data is present on other file systems, use a disaster recovery boot media or an installation media to boot the system and try to recover data on those file systems by first mounting them and then moving data to another file system or tape.

Data is a valuable asset and if your data is really confidential or critical, you can take help of a reliable data recovery services provider. It is worthwhile to avail good data recovery services, but still they do not guarantee a complete recovery as the disk may have been seriously damaged or crashed.

Another best alternative is to run consistency checks and then try to reformat the drive and reinstall the operating system. Now, after configuring your system, you need to create a bootable CD and backup the entire system on a reliable media. You can now easily use the bootable disc to boot and then restore the system. You should always perform full system backups and that too frequently. This will ensure that you do not lose too much data or if the data is really important, have incremental backups and save them to a different device.

Kernel panic is a serious problem and may occur on any platform that you use.      

Exploring the causes of Superblock corruption in Linux and the possible data loss

A Linux file system consists of blocks. Some blocks store user data or files, while the other blocks store the file system’s metadata. The blocks that contain metadata are called metadata structures. A superblock is the most fundamental metadata structure that includes information about the file system, such as file system type, size, status, information about other meta data structures, etc. This information is critical and sensitive. If a superblock gets damaged or corrupt, you may encounter serious data loss. To overcome this problem and recover all lost invaluable data, you need to go for Linux recovery through a reliable third-party utility.

Suppose you use a Linux-based PC. When you attempt to mount your file system, you may receive the following error message on your screen:

“/dev/sda2: Input/output error
mount: /dev/sda2: can't read superblock”

Cause:

The above error indicates that there is some corruption in the superblock. This corruption may be caused due to several reasons, such as virus infection, abnormal shutdown of the system, operating system bug, etc.

As a consequence, all your valuable data present on the hard drive would become inaccessible. At this stage, you may use an updated backup to restore all the lost or inaccessible data. However, if the backup is unavailable, you should follow the below mentioned resolution steps.

Resolution:

Linux maintains multiple copies of superblock in the file system. In case if a damage occurs to the primary superblock, you can use these backup copies to restore the corrupt superblock. To resolve the above problem, you need to mount the partition using different superblock:

• First determine the location of the alternate superblock using the command:

# dumpe2fs /dev/sda2 | grep superblock

You will get the output as shown below:

Primary superblock at 0, Group descriptors at 1-6

Backup superblock at 32768, Group descriptors at 32769-32774

• Now, try repairing the file system using the backup copy of the superblock as follows:

# fsck -b 32768 /dev/sda2

• Use ‘Mount’ to mount your file system:

# mount /dev/sda2 /mnt

If the problem still persists, you should take help of a competent data recovery Linux tool. These third-party software help you safely recover every piece of lost, deleted, or inaccessible data from any Linux-based system. They provide a rich and interactive interface that needs no technical expertise for its proper implementation. Moreover, they support Ext4, Ext3, Ext2, FAT32, FAT16, and FAT12 file systems.

How to fix file system corruption problem in linux when FSCK fails

Although Linux machine is considered as one of the most crash resistant but some times it too suffers from crash due to various unavoidable reasons like file system corruption and hardware failures. File system corruption can be easily resolved by running 'fsck' command, FSCK or "file system check" is a tool to check the consistency of Linux file systems But what will happens if this utility itself fails as the case of extreme corruption . As a consequence, we may lose all the valuable data stored in your system. To overcome the problem, we need to look for some third party Linux data recovery tool to get back our critical data.

    

For instance, we may come across the following series of error messages after starting our Linux machine:   First, we encounter “dev/hda2 contains a file system with errors-check forced” error

The system performs an automatic "File System Check" (fsck) and displays the following messages on your screen-

“unexpected inconsistency RUN fsck manually without -a or -p options” 

“An automatic file system check of root file system failed. fsck should be performed in maintenance mode with root file system in read only” 

“a manual fsck must be performed then system rebooted”

Now lets check the reason behind this error:-

We have to face such behavior because there is some corruption in our file system. The corruption could be due to various reasons, like

 1) Virus infection

 2) Operating system malfunction

 3) Super-block or Inode damage

This will prevent us from accessing the data. An updated backup will help to retrieve all the lost or inaccessible data. However, if the backup is not available, we should follow the below steps to get back the data.

• Run the 'fsck' command manually following the syntax as given below-

              --'fsck [ -F fstype] [-V] [-yY] [-o options] special'

Here 'fstype' is the file system type and 'special' resembles the character device name of the file system. 

If the problem still persists, you should take help of a third party linux recovery tool. These tools are made to recover all the lost data from a Linux-based machine in any case of severe corruption and data loss.

How to get Linux data Back after formatting Of Hard drive

Linux as we know is entirely an Open source Operating system there are thousands of developers independently working on its improvement and hence it is the most frequently updated Operating system due to this the Linux OS system is considered as most Error free system, but the fact is that any machine can go wrong and even the Linux is not an exception.

Sometimes, we may come across the situation when we have to format Hard drive or the drive gets formatted accidentally In these kind of situations we have to take help of some Linux recovery software to get our formatted data back.

Now let us discuss the circumstance which forces us to format the drive or the data is deleted, at times it happens that our system gets corrupted and we are left with no other option than to format the drive, and hence that causes loss of our data. some more situation are given below:

1) Operating system malfunction

2) Formatted the volume to increase partition size

3) Corruption of the file system

4) Severe corruption of the drive due to virus or malware attack

5) Accidental formatting of Hard drive

All the above leads towards loss of critical data loss so it is generally advised to take a complete backup of your critical data before making any significant changes to your machine and if you have not taken any backup of your data we should always remember that data from a drive is never lost unless it is over written and if that is not the case than third party linux data recovery software must be used to get back your data, these software are quiet capable enough to get the lost data back through there highly efficient scanning Algorithm.

Linux file recovery software when critical data loss occurs

Linux has gained enough popularity for its new and updated features. Usually, this operating system is considered as the most regularly upgraded application and hence, with Linux, many users feel that they are having the advantage of using the most recent technologies. Even some feel that Linux is free from virus attack and other data loss problems. However, it is the fact that the technology has nothing to do with data loss. Linux systems also undergo severe data loss situations, leaving the system drive completely inaccessible. Under such cases, you can take the help of any Linux data recovery software to retrieve your data back.

Data loss in Linux can be in any form, starting from the accidental/intentional deletion, formatting of the media, virus/malware attack, operating system malfunction, file system corruption or any other software/hardware contradiction etc.

Whatever, be the reason behind the failure of the Linux system, it is your valuable data in the media which suffers the most. Some data can be urgently required, some are the result of months of research work and some even can never be recreated. In such situations, loss of them caused severe business loss and mental trauma.

Among all the odds, if you have taken regular backups of your data, you always resides at the safe side and can restore the data from a recently taken valid backup. But, if you have not taken any recent backup, you are under serious trouble for sure.

But, among all these troubles of data loss, the good fact is that data from the troubled Linux drive never gets lost permanently. Therefore, if you can take strict measures to avoid overwriting the data in the drive, and run any efficient Linux file recovery utility, then, all you lost data can be easily recovered back.

These undelete Linux applications can work on any Linux operating system based computer system and can recover your lost, deleted, formatted or inaccessible data effectively. These utilities have been developed with many advanced scanning algorithms to dig into the storage media throughly and are completely read-only in nature. Moreover, with detailed instructions at every step and highly graphical user interfaces, they are pretty easy to use even with much technical knowledge.

How to recover linux files after corruption

Installed Applications  and the operations performed by them are critical part of any OS These operations are critical from system point of view to access data from hard drive and run the software, both application and system software. Linux operating system manages all the system related operations through init. It is the most significant step of booting process. However, if it fails to run properly, system becomes unbootable and stored data become inaccessible. This behavior leads to data loss and put you in need of Linux file recovery solutions.

When you boot your Linux computer, init is the step of the process that is identified through process id 1. The init data structure has all controls sequences and processes when you shut down your Linux system. If you encounter errors while starting or shutting down the Linux system, it can be due to missing init file or initrd file corruption.

As a practical example of this problem with your Linux OS based computer, you may get the below error while booting the computer-

“Kernel panic: No init found. Try passing init= option to kernel”

As stated in the error message, Linux cannot find init file. The file may also be inaccessible due to corruption. At this point, data become inaccessible and Linux data recovery becomes very essential .

Root Cause:-
You may face this problem due to any of the below reasons-
The ‘root’ parameter of Linux Kernel statement is not pointing to a valid hard drive volume or hard drive.
Initrd file is damaged or corruption. The problem can also occur if the file has been deleted.
Initrd statement is not put at right place when GRUB requires it.

Steps to resolve
Follow the below given Linux recovery steps to recover lost data-
Make sure that initrd file is at correct position.
Change root parameter to the additional parameter that contains root directory of your Linux system.
Use Linux Rescue CD to restore damaged initrd and init files from it.
If the problem persists, format entire hard drive and reinstall operating system. Afterwards, restore data from backup.
If backup is not in place, then you need to perform data recovery Linux using third-party applications.

These linux file recovery tools are capable of methodically handling all data loss situations. They help you recover data in a safe and easy way.