In such cases, the data saved in the Linux based hard drive becomes inaccessible. To access the data in such cases, the user needs to opt for an updated backup. However, if updated backup is unavailable or corrupt, then the user needs to use an effective third-party Linux Data Recovery application.

Consider a practical case, where you attempt to boot your Linux based system and encounter the below error message:

“EXT2-fs error …ext2_check_descriptor: Block bitmap for group 0 not in group !

EXT2-fs: group descriptor corrupted”

Your system becomes unbootable after the occurrence of the above error, rendering to inaccessibility of hard drive data.

Cause:

As described in the error message, the group descriptor is corrupted or damaged.

Resolution:

The above error message can be resolved by taking the below actions:

•    You will need to run FSCK command with alternate data structures.

•    If the problem persists, then you will need to format your hard drive and re-install the operating system.

The later resolution enables you to overcome corruption in block group descriptor. However, the resolution also has a drawback that it deletes all the data from your hard drive. In such cases, the deleted data from the hard drive can be recovered by using advanced a Linux Recovery application.

A Linux Recovery software performs a complete scan of your formatted hard drive and recovers all the lost data. The software is built in wizard-style interface, which makes it easy to understand without any technical skills.

Stellar Phoenix Linux Data Recovery takes complete guarantee of recovering all formatted data post formatting. The Linux Recovery utility supports recovery from Ext4, Ext3, Ext2, FAT file systems based volumes. It us compatible with SlackWare, Gentoo, Ubuntu, SUSE, Mandrake, and more Linux distributions. Its demo version allows you to preview all the recoverable files.

While most of the disk encryption tools implement incompatible and different, undocumented formats, the LUKS determines a platform-independent encryption standard to use in several tools. It not only provides interoperability and compatibility amongst many different applications, but also insures that they apply password management in a documented and secure manner.

Although, LUKS is a pretty useful standard to encrypting your confidential data and information, but under some circumstances it may lead to critical data loss. You may come across data loss if you perform any of the below operations on your Linux hard drive that uses LUKS encryption:

•    Boot the kernel with noresume, noresume2 options or non-matching hibernating Linux kernel and resume from the previous image on next boot.

•    Mount partitions, which are mounted during suspended and then you try to resume them.

•    Try to resume the process with different Linux kernel. If new kernel has the suspend2 support, you encounter a warning message bout the version mismatch. At this point, you should press Shift key for rebooting the system. You must not continue booting the system. Resuming the system with different kernel may crash or corrupt the system and may lead to file system corruption.

•    Boot your system with any of the itoi, iswsusp, or is2 matching arguments to appropriate kernel in init script.

In such situations, backup proves a real help to preform Data Recovery Linux. You can easily restore your valuable data from backup. However, if the backup is either not updated or not available at all, you are required to opt for third-party recovery solutions.

The Linux Recovery Software enables you to scan entire hard drive through high-end scanning techniques and extract all lost, missing, and inaccessible data. They are incorporated with simple and rich graphical user interface, and thus allow you to carry out Linux Data Recovery on your own. The applications preserve integrity of your data as they have read-only and non-destructive conduct.

Stellar Phoenix Linux Data Recovery is the most efficient utility for assured recovery of lost Linux data. It works well with all major distributions of Linux operating system, such as SUSE, Fedora, Red Hat, and Ubuntu. The software recovers data from Ext4, Ext3, Ext2, FAT32, FAT16, and FAT12 file system volumes.

The LVM (Logical Volume Manager) and LUKS (Linux Unified Key Setup) metadata structures are stored on original drive in Linux volume group. The journaling file system, like Ext4, move around it, as the disk space is employed or occupied.

Although the process of expanding the LVM drive is risky, it is not impossible. You can moderate the method for Ext4, LUKS, and LVM without losing your precious data. To do this, you need at least 4 storage devices, if you are expanding two hard drives.

Go through the underwritten steps to perform mitigation for the spanned LVM without losing data and requiring Linux Recovery solutions:

•    First of all, create the Physical Volumes.

•    After that, create a volume group.

•    Create LUKS volume on the top of Logical Volume Manager.

•    Create a File System and external journal.

•    Close all the windows and backup your hard drive data.

Note- Although, the above methods work in various situations, there is no guarantee of reliability. It is only a conscription method and can not replace complete backups.

The major advantage of the above method is that when any physical drive fails, journal is external and thus you can mount volume as read-only to backup data. This method also protects your system against metadata corruption or loss, as you should create regular backup of primary physical drive and can clone the drive.

However, if any disk fails on your system in this configuration, you encounter serious data loss situations. At this point, you need to perform Data Recovery Linux to get your mission-critical data recovered.

The recovery is best possible with the help of powerful professional Ext4 Recovery software. They are powerful enough to systematically scan the entire hard drive and extract all lost, missing, and inaccessible data from it. With simple graphical user interface and read-only conduct, they are totally easy and safe to use.

Stellar Phoenix Linux Data Recovery is the most prominent tool that ensures perfect recovery in most of the data loss scenarios. It recovers lost data from Ext4, Ext3, Ext2, FAT12, FAT16, and FAT32 file system volumes. The software is compatible with all major Linux distributions, including SUSE, RedHat, Ubuntu, Fedora, and Mandriva.

To explain file system corruption in detail, consider the below error message:

“du -x
du: WARNING: Circular directory structure.
This almost certainly means that you have a corrupted file system.
NOTIFY YOUR SYSTEM MANAGER.
The following directory is part of the cycle:
`./mnt/root’”

The error message appears at the time of booting of your system. Once it appears, the data saved in the hard drive becomes inaccessible. Furthermore, the same error message pops up every time you attempt to boot your system.

Resolution:

To resolve corruption in file system and to access the data saved in the hard drive partition:

Run FSCK command to repair the corrupted file system.

If the command is unable to repair the file system, then re-install the operating system.

Re-installing the operating system will resolve any corruption issue related to file system. It also allows the user to store new data on your hard drive. However, re-installing also has a disadvantage. It erases the entries of previous file system and makes all the data inaccessible. To recover this data, the user needs to opt for a Linux Recovery tool.

A Data Recovery Linux utility employs high-end scanning methods to recover lost files, even after reinstalling the operating system. The software can be used by any user, irrespective whether s/he has performed data recovery.

Stellar Phoenix Linux Data Recovery recoups formatted files (of any type and size) and restores it at location selected by you. Compatible with Ext4, Ext3, Ext2, FAT file systems, the read-only Linux Data Recovery tool supports Ubuntu, SUSE, SlackWare, Mandrake, Gentoo, and other Linux distributions. The tool is easy to understand and does not requires any technical knowledge

It is possible to use Windows operating system on the system which has Linux operating system installed. It is known as dual-boot configuration. It enables you to boot from either of the two operating system, Linux and Windows. If you’re working on MS Windows operating system in a dual-boot configuration and attempt to access Linux hard drive volume, you can easily mount the volume and access it.

However, in some situations, using a dual-boot configuration may cause critical problem. Practically, when you attempt to access a Linux hard drive volume by mounting it, you may encounter any of the below error message:

“Can’t find ext2 File System on dev ide1 (22, 65)”

Or

“mount: wrong file system type, bad option, bad superblock, or too many mounted file systems”

The above error messages render your Linux volume inaccessible. If you boot the system using Linux operating system, it does not boot and you encounter the above error message again and again.

Grounds of the issue

You may encounter this, due to a wide range of reasons, including file system corruption and hard drive volume corruption. The volume or file system may get damaged after improper hard drive mounting, unexpected system shutdown, user errors, virus infection, and other similar situations.

This behavior puts all your valuable data at stake and you have to perform Data Recovery Linux to get your precious data back and save your business.

You can effectively and quickly recover lost data from Linux hard drive using Ext2 Recovery software. They are particularly designed to methodically scan the affected hard drive fully, and perform absolute Linux Recovery in all cases of logical data loss. With simple graphical user interface and read-only conduct, they are easy and totally safe to use.

Stellar Phoenix Linux Data Recovery is the most effective application that ensures perfect recovery of all lost data. The software recovers data from Ext4, Ext3, Ext2, FAT12, FAT16, and FAT32 file system volumes. It works well with all major distributions of Linux operating system including Red Hat, SUSE, Debian, Fedora, and Ubuntu.

Consider a practical case, where you attempt to boot your Linux based system, and you receive the below error message:

“EXT3-fs: hdc1: could not mount because of unsupported optional features (40004000)

mount: wrong fs type, bad option, bad superblock on /dev/hdc1, or too many mounted file systems.”

Your system becomes unbootable after the above error message pops up. In such cases, the data saved in the hard drive becomes inaccessible.

Cause:

The root cause of the above bootable error message is bad/corrupt superblock. Corruption in superblock can occur due to improper system shutdown, operating system malfunction, and virus infection.

Resolution:

Below are some steps that might help you get over above error message:

Use the alternative superblock for booting.

If the alternative superblock is itself corrupt, then you will need to rebuild the superblock and run FSCK command.

However, if the issue persists, then you need to format your system.

Formatting guarantees complete resolution of the above problem. However, the only problem with formatting is that it also deletes the hard drive data. This problem calls for an effective Linux Data Recovery tool that can recover data even after formatting. Such Linux Recovery

utilities are downloadable from the Internet. These tools can be installed and used by even a non-technical user.

Stellar Phoenix Linux Data Recovery is a solution for recovering deleted data after formatting. The Linux Recovery utility is competent enough to recover lost, deleted, and formatted data from Ext4, Ext3, Ext2 and FAT file system based volumes. Supported by almost all Linux distributions, the tool allows the user to save the recoverable data at required location.

As a practical example, you may encounter the below SCSI CRC error while booting your Linux operating system-based computer:

“Creating Root Device

mounting root file system

(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) ……”

After the above error message, system reboots repeatedly. In order to fix this behavior and get your data back, you need to find out the reason for the occurrence of this problem and perform Data Recovery Linux by resolving it.

Cause

At first, this problem seems to be caused by hardware problems, but in fact it is related to the logical part of Linux. It may take place due to any of the below:

•    Corruption in /boot directory of Linux

•    Corrupted initrd

•    File system corruption

Any of the above problems render the Linux system unbootable.

/boot- It is Linux directory that contains all critical information that Linux needs at boot time.

initrd- It is a temp root file system, which is mounted while booting the system, to support two-state boot procedure.

Resolution

You can try to fix this issue by restoring the /boot directory through Rescue CD. Hard drive cloning and diagnosing can also by tried. However, if the file system is causing the problem, it is not possible to solve the problem using these methods.

You need to go for third-party professional Linux Data Recovery software to ensure quick and absolute recovery of all your lost, missing, and inaccessible data. The Linux Recovery applications are incorporated with high-end scanning methods to retrieve data in all cases of logical data loss.

Stellar Phoenix Linux Data Recovery is an easy and safe tool to retrieve lost Linux files, directories, and hard drive volumes. The software recovers data from Ext4, Ext3, Ext2, FAT12, FAT16, and FAT32 file system volumes. It works well with all major distributions of Linux operating system including SUSE, Red Hat, Debian, Fedora, and more.

When you delete files from the Ext4 hard drive volume or data is deleted because of formatting of the volume, the files remain physically intact. Deletion does not actually delete the files. It merely deletes the file system entries and file system pointers. Thus, operation system can not locate any files at a location and it declares disk space as available. But, you must know that the deleted files can be recovered by applying Linux Data Recovery methods.

You can easily recover deleted files from Ext4 file system volume through “Extundelete” utility. The utility examines file system journals and other Ext4 metadata to recover data, using ext2fs library. This utility is based on ext3grep tool. Extundelete is able to retrieve both the file name and contents of deleted file.

Although, Extundelete is a very useful and effective tool, but it can not guarantee absolute recovery of a particular file. Moreover, Extundelete can not perform Data Recovery Linux if the Ext4 file system journal is damaged or deleted.

In such circumstances, backup proves really helpful. It is the most excellent way to safeguard your data against all types of data loss situations. But, if the backup is not available or it is not updated, you may face grave situations of data loss.

At this point, it is possible to recover your precious data from Ext4 file system volume, through Ext4 Recovery Software. These are powerful third-party applications, which carry out extensive scan of entire Linux hard drive to ensure perfect recovery of lost files, directories, and hard drive volumes. The software have self-explanatory and simple graphical user interface and read-only conduct for easy and safe recovery.

Stellar Phoenix Linux Data Recovery is the best ever made software for assured recovery of lost Linux data. It recovers data from Ext4, Ext3, Ext2, FAT32, FAT16, and FAT12 file system volumes. The software is designed for all major distributions of Linux operating system such as SUSE, Debian, Red Hat, Fedora, and Ubuntu.

In a practical scenario, you may encounter the below error messages after copying your data through ddrescue command-line tool and running e2fsck utility:

“Superblock has a bad ext3 journal (inode 8).
Clear? Yes”

Or

“/dev/sdf was not cleanly unmounted, check forced.
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Missing ‘..’ in directory inode 1785876.
Fix? Yes

Pass 3: Checking directory connectivity
Root inode is not a directory; aborting.
e2fsck: aborted
fsck.ext2 /dev/sdf failed (status 0×8). Run manually.”

After the above error message, you can not access your precious data from the hard drive. In order to get your lost data back, and to sort out these errors, you should perform Data Recovery Linux.

Resolution

The problem is caused by bad block at the starting of inode table. You can fix the problem by reconstructing root inode. It is quite easy to reconstruct the root inode, however the problem is that root inode needs to be placed at fixed location and currently a bad block is located there.

Forcing the hard drive to use spare block from its pool is possible, however a bad block is often an indicator of the beginning of hard drive crash. Thus, replacing the affected hard drive with new one is the safest way to recover from this situation. Use ‘dd’ command to copy data from old hard drive to new one. Then run e2fsck to create a new root directory on the new hard drive, and shift all the inodes, respectively.

If the above method does not solve your problem, Linux Recovery applications perform absolute recovery. They use high-end scanning techniques to methodically scan the entire hard drive and get all your precious data recovered. The Linux Data Recovery software come equipped with simple and rich graphical user interface to enable easy recovery.

Stellar Phoenix Linux Data Recovery is the most effective solution for all logical data loss scenarios. The software recovers Ext4, Ext3, Ext2, FAT12, FAT16, and FAT32 file system volumes. It is compatible with all major distributions of Linux operating system such as Red Hat, Debian, Fedora, SUSE, and Ubuntu.

As a practical case, below error message pops up when you attempt to boot your Linux based system:

“GRUB loading.
Welcome to GRUB!

error: the symbol ‘grub_env_find’ not found.
Entering rescue mode…
grub rescue>

Please consider upgrading the severity of this bug to critical.”

All the data saved in the hard drive becomes inaccessible after the above error message pops up. Additionally, the same error message pops up every time the user boots the computer.

Cause:

The root cause liable for the occurrence of the above error message is improper upgradation or corruption of GRUB boot loader.

Resolution:

To resolve the above error message and to access the hard drive data, you will need to follow the below steps:

Install another GRUB from another system to boot your system.

If that doesn’t helps, format the hard drive.

Formatting is one of the most common measures followed by most of the computer users to overcome any boot error message. The process installs a new file system on your hard drive and deletes all the entries of the previous file system, resulting in inaccessibility of all the hard drive data.

While most of the users think that the data after formatting is permanently lost, the fact is that it can be easily recovered by using an advanced Linux Recovery tool. Such Linux Data Recovery software easily recover all kinds of files from a formatted Linux based hard drive.

Stellar Phoenix Linux Data Recovery is an effective Linux Data Recovery tool that recovers formatted data from Ext4, Ext3, Ext2, FAT file system based volumes. The tool supports almost all Linux distributions, like Ubuntu, SUSE, SlackWare, Mandrake, Gentoo, etc. The read only tool is available as demo and complete version.