Stellar Phoenix Linux Recovery

A kernel in Linux operating system is like a mediator between the hardware and programs. The memory management program ensures a systematic contact between the hardware and the programs, and all programs get appropriate share in the processor’s cycle. A Kernel is upgraded mainly when you need a device driver for a new hardware. A new Kernel is easily available on the Internet. While upgradation of Kernel is an easy task, it might result into a bootable error message. This error message halts the booting process of your system, resulting into inaccessibility of all the hard drive data. In such situations, an updated acts a life-saver and allows you to restore the data. But, with numerous instances of backup unavailability and corruption, you always have an option to use advanced Linux Recovery software.

Consider a practical case, where you upgrade your Kernel and you encounter the below error message while booting your system:

“Should I run /sbin/lilo? (y/N) y

Warning: The boot sector and map file are on different disks.

Added Gentoo-2611-r9 *

Added Gentoo-2611-r8

Added Gentoo-2611-r6

Fatal: First sector of /dev/hda1 doesn’t have a valid boot signature

There was a problem running /sbin/lilo.

Checking for SILO…No

Checking for PALO…No

Should I make a bootdisk? (y/N) n

WARNING: Your system is probably unbootable now.  After correcting any

problems, rerun this script with the command `mkboot -installkernel’.

make[1]: *** [install] Error 1

make: *** [install] Error 2”

After the above error message appears, the data saved on your hard drive becomes inaccessible.

Cause:

The above error message pops up in case the new upgrade is not compatible with the system, or the upgrade was not performed systematically.

Resolution:

The resolution for the above error message is discussed below:

Run FSCK command in boot partition.

If the problem persists, format your hard drive.

While formatting allows you to isolate the above error message, it also deletes all the saved data from your Linux-based hard drive. In such cases, if you wish to recover your formatted data, then you will need to use advanced third-party Linux Recovery application. A Linux Data Recovery tool is easy to implement and does not requires any prior technical knowledge.

Stellar Phoenix Linux Data Recovery is a powerful application to recover lost, deleted, and formatted data from Ext4, Ext3, Ext2, FAT file system based volumes. Supported by almost all Linux distributions (Ubuntu, SUSE, SlackWare, Mandrake, Gentoo, etc.), the read only Linux Data Recovery software is embedded with powerful features like File Filter, RAW File Recovery, Append File Header etc.

Are you facing “Read-only file system” error while booting your Linux computer? Does your system refuse to boot up in dual-boot configuration with Microsoft Windows operating system? When you encounter this behavior, system can not boot up and your data becomes inaccessible. At the same time, system may stop responding and you need to perform hard reboot. This overall behavior leads to significant data loss on your Linux system and need Linux Data Recovery to be sorted out.

In order to try fixing this issue on your Linux computer, identify the root cause of this problem. You may come across such circumstances due to any of the below reasons:

Damaged or corrupted file system

Improper unlock addresses for the LPC (Low Pin Count) flash chip

Hard drive failure

Linux automatically re-mounts the file system as read-only, if a hard drive failure takes place. In order to detect the affected system component and fix it, go through the underwritten steps:

To check error, integrity, and consistency of file system, unmount it first. If you can not unmount the file system, being root file system, force file system check at next reboot. If you find that file system is corrupted, hard drive formatting is required to rebuild or replace the damaged file system.

Run fsck command-line utility on the affected Linux hard drive. It is an in-built tool of Linux operating system, which lets you repair a number of issues with inode structure, data blocks, directory structures and more.

If hard drive failure is the problem, format hard drive, reinstall operating system, and restore data from the most recent backup.

Formatting is the process of creating a new copy of all the hard drive data structures, including file system. It removes every type of errors from the hard drive and make it as a new drive, deleting all the data, applications, and even operating system from it.

This process causes severe data loss, if the backup is not in place. In such conditions, Linux Recovery come for your rescue. You can carry out safe, quick, and easy Data Recovery Linux through third-party recovery applications.

Such tools are known as Linux Recovery Software. They use advanced scanning techniques to perform thorough scan of data loss affected hard drive and carry out absolute recovery in most of the logical data loss situations.

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

Modern distributions of Linux operating systems use UUID (Universally Unique Identifier) to uniquely identify hard drive or other data storage devices, in place of the conventional block names like /dev/sdb and /dev/hda1. It is due to the fact that UUID is never modified, even if the hard drive is switched. It is stable as compared to traditional methods, and prevents system failure and need of Linux Data Recovery solutions.

UUID is a 128-bit string that is used for making the Linux hard disk management simple. If you look at /etc/fstab file in your Linux computer, you find the entry in the following format, in place of the familiar hard drive designation:

UUID=62fa5eac-3df4-448d-a576-916dd5b432f2

In comparison to the traditional hard drive identification techniques, UUID is quite easy and reliable. For instance, in the traditional Linux systems, when you try to insert a new hard drive in a system that already has two hard drives, the drive is inserted between existing drives. At this point, ‘mount’ command attempts to mount the newly inserted drives as home.

In such situation, you need to log on as a single user for resolving the problem. However, when you log on, it gives you some error message and in the worst case scenario, you may encounter kernel panic. You can fix this issue using UUID.

UUID creates a unique entry for each hard disk volume in the Linux file system tree. Using UUID offers easy management of your Linux hard disks and creates less complication while adding or removing the disk.

Although, UUID is quite useful and it provides various advanced features, but it also has some faults. Sometimes, you may encounter the below error message when you attempt to access a UUID based Linux hard drive:

“Fsck 1.40.8 (13-Mar-200
fsck.ext3: Unable to resolve ‘UUID=d8533154-cef1-4cce-a823-9f3f74aab65b’”

After the above error message, you can not access the particular hard drive. All the data stored on your hard drive become inaccessible and you come across critical data loss. At this point, Linux Recovery Software come for your rescue.

The applications perform absolute Data Recovery Linux in most of the logical data loss situations, using advanced scanning algorithms. These tools enable you to perform Linux  Recovery on your own as they have self-descriptive and simple graphical user interface. With read-only and non-destructive behavior, the applications are completely safe to use.

Stellar Phoenix Linux Data Recovery is the most comprehensive application for perfect recovery of all lost data. The software is compatible with all Linux distributions including SUSE, Debian, Red Hat, and Fedora. It recovers lost data from Ext4, Ext3, Ext2, FAT32, FAT16, and FAT12 file system volumes.

In Linux operating system, the hard drive volumes are mounted by the disk labels, in place of the device paths. It is a quite effective approach because the disk path and name can get changed when you boot your system and so can create a number of complications for your system. Therefore, the labels are assigned to Linux volumes so that they can mount at correct place. But in some situations, the disks can not be mounted and accessed due to disk label corruption and you come across critical data loss situations. In order to extract lost data in such situations, Linux Data Recovery is required.

The disk label is a quite significant data structure for accessing a Linux hard drive volume. All the entires for volumes to be mounted during boot time are stored in /etc/fstab file. When disk labels get damaged, Linux volumes can not be mounted and thus all your critical data becomes inaccessible.

This issue may occur during boot time. In case of unexpected system shutdown, when you reboot the system, fsck runs automatically at startup. This command-line utility checks integrity of hard drive and file system to detect and repair errors. However, incomplete or improper processing of this tool may increase the chances of file system corruption and data loss. This behavior of Linux operating system needs Data Recovery Linux to be handled.

When you run the fdisk command to manipulate hard drive partition table, following error message may occur and the process gets terminated:

“Warning: invalid flag 0×0000 of partition table 4 will be corrected by w(rite)”

The above error indicates that the label of particular volume is corrupted and due to the same, volume can not be either seen or accessed. In such cases, backup proves as real help to restore your data from affected storage media. But in case if the backup is not available, Linux  Recovery Software are needed for extracting lost data.

These applications are particularly designed to thoroughly scan the whole hard drive and extract all lost, missing, and inaccessible data from it. The Linux Data Recovery applications are completely easy to use as they have simple and rich graphical user interface. With read-only and non-destructive conduct, such tools perform safe recovery without altering original data on the drive.

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

The hard drives can be divided in one or more parts, known as partitions. The division of hard drive is described in partition table, stored in sector 0 of hard drive. Linux operating system requires at least one hard drive partition, namely for the root file system. It may use the swap files and swap partitions, however the latter are quite efficient. Thus, generally you may want second Linux hard drive partition devoted as the swap partitions. In some cases, improper use of hard drive management tools can cause data loss and need Linux Recovery to be sorted out.

On the Intel hardware, the BIOS (Basic Input/Output System) that boots up your system and can generally only access first 1024 cylinders of hard drive. Due to the same, you may need to create third hard drive partitions if your hard drive is large in size. This partitions is generally mounted on the /boot , for storing kernel image and some auxiliary files required at boot time, so that BIOS can access them.

You can create the manipulate the partition table in Linux using a menu drive program, known as fdisk. However, this tool can not understand the GPT (GUID Partition Table) and is not work with large partitions. Fdisk understands DOS partition table and BSD/SUN disklabels.

The Fdisk automatically obtains the hard drive geometry, if possible. It is not inevitably physical disk geometry (as modern hard drive don’t actually have physical geometry), but is disk geometry that is used for DOS type partition tables.

Generally everything works fine if only the Linux operating system is installed on your drive. But, in dual-boot configuration, you should let the Fdisk from other operating system create at least one partitions. While booting the Linux operating system, it considers partition table and attempts to derive what geometry is needed for effective cooperation with another operating system.

Before you proceed for any operation on your hard drive, it is recommended to create complete backup of your significant data. When you backup data using dd command, you need to be careful. A minor mistake may cause severe data loss and need Data Recovery Linux to be handled.

Linux Data Recovery is possible with the help of powerful third-party tools, known as Linux Recovery Software. The applications are particularly designed to carry out thorough scan of the drive and extract lost, missing, and inaccessible data from it.

Stellar Phoenix Linux Data Recovery is the most advanced tool for absolute recovery. The software recovers data from Ext4, Ext3, Ext2, FAT32, FAT16, and FAT12 file system volumes. It is compatible with all major distributions of Linux operating system including Red Hat, Debian, SUSE, and Fedora.

Upgrading your system with latest version of Ubuntu enables you to support the latest drivers, BIOS (Basic Input Output System), and advanced applications. While the upgradation process is simple and easy-to perform, it might result in booting problems if interrupted or performed in disorganized manner. In most of these situations, you receive a booting error message that results in inaccessibility of the data stored in your hard drive. To access the hard drive data in such scenarios, an updated data backup always helps. It allows you to restore the required data. But, if no data backup is available, then you can turn on to an advanced third-party Linux Data Recovery utility that enables you to recover your lost, missing, and deleted data.

For example, you upgrade from Ubuntu 9.04 to Ubuntu 9.10. However, when the upgradation process gets finished and you attempt to boot your system, you receive the below error message:

“error: no such device : ba123456-7890-abcd-efghijklmnop
Failed to boot default entries
Press any key to continue”

Once the above error message appears, your system becomes unbootable resulting into inaccessibility of the hard drive data. In addition, the error message pops up every time you press any key.

Cause:

The cause for the error message is improper upgradation of Ubuntu.

Resolution:

Follow the below steps to resolve the above error message:

1.Boot your computer using Ubuntu 9.10 CD.

2.Start terminal and then log on as a manager in nautilus file manager.

3.Next, go to “/boot/grub/grub.cfg” and right-click grub.cfg.

4.Select Properties and select tab permissions. Modify the permissions of “owner:root” to “read and write”

5.Right-click grub.cfg and find the below entry:

### BEGIN /etc/grub.d/10_linux ###
menuentry “Ubuntu, Linux 2.6.31-14-generic” {
recordfail=1
if [ -n ${have_grubenv} ]; then save_env recordfail; fi
et quiet=1
insmod ext2
set root=(hd0,1)
search –no-floppy –fs-uuid –set ba123456-7890-abcd-efghijklmnop
linux /boot/vmlinuz-2.6.31-14-generic root=UUID=ba123456-7890-abcd-efghijklmnop ro quiet splash
initrd /boot/initrd.img-2.6.31-14-generic

6.Change the above entry to relatively simpler one, as done below:

### BEGIN /etc/grub.d/10_linux ###
menuentry “Ubuntu, Linux 2.6.31-15-generic” {
set root=(hd0,1)
linux /boot/vmlinuz-2.6.31-15-generic root=UUID=ba123456-7890-abcd-efghijklmnop ro quiet splash
initrd /boot/initrd.img-2.6.31-15-generic
}

7.Modify the permissions of “owner:root” to “read-only” and restart your system.

If you receive the error message even after following the above steps and your data remains inaccessible, then you will need to use Linux Data Recovery software to recover your data. Such Data Recovery Linux tools perform recovery in almost all data loss cases.

Stellar Phoenix Linux Data Recovery is an effective Data Recovery Linux application that supports recovery from all Linux distributions, including Caldera, Red Hat, SUSE, Sorcerer, Debian, Mandrake,  etc. It is compatible with Ext2, Ext3, Ext4, and FAT file systems.

Linux Superblock is an important data structure of its file system. The Superblock comprises of basic information, like file system size, type, status (mounted or umounted) etc. The file system  manager uses this information to maintain the file system. The file system size described in Superblock should match with the actual one or otherwise, the system will report the disk as corrupt. In such situations, it is essential that you have a suitable backup of your important data. The solution to such problems may compel you to delete stored data. So, if the backup fails or is unavailable, you may need to use a Linux Data Recovery solution.

For example, you can encounter the below mentioned error with your Linux-based disk:

“The filesystem size (according to the superblock) is xxx

The physical size of the device is yyy.”

The error further suggests that either the Superblock or the partition table is corrupt. Generally, you receive this error after running fsck.

Cause

The above error can occur due to one of the possible reasons:

The system or an application is trying to write on the disk location of Superblock. The error occurs when the Linux system prevents this action.

The Linux Superblock or partition is corrupt.

Solution

You should try following the below mentioned steps to overcome this issue:

Boot the computer in single-user mode

Use unmount -a to unmount all the partitions

Run fsck to repair all the disk partitions

Resize the disk partitions using resize2fs  command

Before applying the steps discussed above, it is highly recommended to backup your data first. If the problem persists, you can reformat the partitions and restore from the backup later.

For any reason if you backup seems irrelevant or incomplete, you are suggested to use a third-party Data Recovery Linux application. These products are exclusively designed to scan an affected Linux disk and extract the lost data. Linux Data Recovery applications are feature-rich tools with high competency to recover data in each logical crash. Moreover, these software are easy to install and use with self-explaining documentation.

Stellar Phoenix Linux Data Recovery is an advanced, yet safe, data recovery application that recovers lost and deleted data from Linux disks. The powerful Data Recovery Linux tool supports Ext2, Ext2, Ext4, and FAT file system. The tool is compatible with Linux distributions, like Red Hat, SUSE, Debian, Caldera, Mandrake, Sorcerer etc.

Linux is a popular open source operating system, which offers great security features. You can install Linux operating system on a system that is already using Windows operating system, by making it dual-boot. The dual-boot configuration allows you to use features of both operating system. The boot loader enables you to select any of these operating system to boot from. However, in some situations, this behavior may cause damage to the Linux volume. This behavior leads to critical data loss and you need to use Linux Data Recovery to get your precious data back.

In a dual-boot system, you can access data from your Linux hard drive, even if you have used Windows operating system to boot the computer. To access data, you need to mount the Linux volume. But in some situations, when you attempt to access the Linux volume by mounting it, the process can not complete and you encounter any of the below error messages:

“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”

When these errors occur, you can not access data from the Linux hard drive partitions. If you try to boot the system using Linux operating system, it stops responding with some boot errors. It causes data loss and need Data Recovery Linux to get your valuable data back.

Cause

The issue occurs due to corrupted or missing Ext2 file system of your Linux volume. The file system or Linux hard drive volume may get damaged due to numerous reasons such as virus infection, power surges, improper system shutdown, operating system malfunction, and improper mounting of the hard drive.

Resolution

You can sort out this problem by restoring lost data from the most recent backup. Backup is the most excellent solution to prevent data loss situations. However, if you do not have backup or its not updated, Linux Recovery is required to handle the situation.

The recovery is best possible with the help of third-party Ext2 Recovery applications. The tools use powerful scanning algorithms for in-depth scanning of the hard drive and extracting lost data from it. You can easily recover lost data using these programs even if you do not have prior technical skills as they have simple graphical user interface.

Stellar Phoenix Linux Data Recovery is a read-only and advanced application to recover all types of lost data. The software recovers data from Ext4, Ext3, Ext2, FAT32, and FAT16 file system volumes. It is compatible with all popular distributions of Linux including Red Hat, SUSE, Fedora, Debian, and Mandriva.

File system is the most critical data structure of Linux operating system, which is responsible for organizing data on the hard drive. It ensures quick and easy accessing of your data from the disk. Linux uses file system entries to locate files on the hard drive and access them. But, in some cases, the Linux file system become read-only and you can not access data from your system. The system even refuse to boot up and you come across data loss scenarios. To retrieve lost data in such cases, Linux Data Recovery is required.

In a practical scenario, you may encounter the following error message on your Linux computer that is dual-boot with Windows operating system:

“Read-only file system”

The above error message occurs while mounting Linux partition. After this error message, you can not write or edit data on the hard drive. At the same time, your Linux system may stop responding and you need to do hard reboot.

This behavior of Linux operating system creates mayhem for you and your most valuable assets- data. It might create a thought in your mind that if you need to perform Linux Recovery or not. In order to find out the possibility of data recovery, you need to consider exact cause of this problem. The above issue may occur due to any of the below reasons-

Disk failure

File system corruption

Wrong unlock addresses for the LPC flash chip

If the hard drive is failed, file system is mounted in the read-only mode to prevent further damage to your system. To detect and fix the problem, try out following things-

Check file system errors. If you can not unmount the file system, force the file system check on next system boot. If you find any error, hard drive formatting and file system rebuilding is required.

Run fsck command-line utility on the failed Linux hard drive. It detects and repairs minor file system errors.

If you format the hard drive, all of your critical data is removed from the drive. In order to retrieve lost data in such cases, Linux Recovery solutions are required.

Recovery is best possible with the help of powerful and advanced Linux Data Recovery applications. The software work in all cases of logical data loss. With read-only conduct and rich graphical user interface, the applications are completely safe and easy to use.

Stellar Phoenix Linux Data Recovery is the most advanced and efficient tool for assured recovery. It recovers data from Ext4, Ext3, Ext2, FAT32, and FAT16 file system volumes. The software is compatible with all major distributions of Linux operating system including Red Hat, SUSE, Fedora, and Debian.

Ext2 is widely used and powerful file system of Linux operating system. It provides high-level security, reliability, and data management. Space in the Ext2 file system is split into blocks, and managed into the block groups, correspondent to the cylinder groups in UFS (Unix File System). Every Block Group contains a data structure that describes it, known as Block Group Descriptor. However, in case of corruption to the Block Group Descriptor, you may come across file system corruption and data loss in Linux. In such circumstances, you need to opt for Linux Data Recovery solutions to get your precious data back.

File system use Block Group Descriptors for reducing external fragmentation and minimizing the amount of disk seeks while reading large amounts of the sequential data. Every block group might have a copy of block group descriptor table and superblock. All block groups have following information:

Block Bitmap

Inode Bitmap

Superblock

Inode Table

Data Blocks

The block group descriptors contains location of block bitmap, the inode bitmap, and start of inode table for each block group and they are stored in the group descriptor table. The Block Group creates copy of Block Group Descriptor, excluding its components, which are used by the operating system and file system for accessing stored data from Linux hard drive.

Because of increased use and complexity of the Block Group Descriptor, there are strong chances of failure. In some situations, when you attempt to access any specific file or directory from the Linux hard drive, you may come across any of the below error message:

“Inode entry of the file is deleted”

“File not found”

“File <file name> is inaccessible”

Such error message occurs due to corruption to the Block Group Descriptor. The corruption may occur due to numerous reasons such as registry file deletion, virus infection, and software conflicts. In such cases, operating system can not locate required files and thus you come across data loss situations. At this point, Linux Recovery is required to get your mission-critical data back.

Data Recovery Linux is best possible with the help of powerful and advanced third-party applications, known as Ext2 Recovery software. They use efficient scanning techniques to carry out in-depth scan of entire storage media and extract all lost, missing, and inaccessible files from it.

Stellar Phoenix Linux Data Recovery is the most commanding application to recover data in all possible data loss situations. It recovers data from Ext4, Ext3, Ext2, FAT16, and FAT32 file system volumes. The software works well with all major distributions of Linux operating system including Red Hat, SUSE, Debian, and Fedora.