Solution to disk label corruption in LINUX

The LINUX operating system is very much similar to UNIX and has derived many basic design principles from it. Day by day, LINUX OS has improved upon its previous versions and indeed has incorporated a number of distinguishable features over other operating systems. In LINUX, disk drives are mounted through file system volume label and not the device path. This is a newer concept applied in LINIX in order to avoid the ambiguity in distinguishing after a disk has been removed and some other have been inserted with the same device path. However, if there is corruption to the volume label, the situation becomes more complex, keeping the data from the drive completely inaccessible and a LINUX data recovery utility is a must to recover the inaccessible data.  

To be a bit more elaborative, suppose, your system disk is at /dev/sda2. The system may have mapped another disk as /dev/sda2 and hence, your fstab, where all entries of the mounted disks are there, will be messed up making your system start improperly. At times, such issues can cause huge loss of data.

These kinds of situation may fire the command fsck automatically to check the LINUX volumes each time the system boots-up. As fsck, checks for file system errors and tries to repair the same, it may take a significant amount of time. Any power surge or system crash during the process may cause serious system instability and data loss. This is an added problem that may further flash a warning message and further increase the chances that your LINUX volumes become inaccessible. The message may read as below:

“Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)”

The warning message tells that the disk label has been corrupted and that is why the data in the drive is inaccessible. If running Disk Utility or fsck command fails, you have to restore the data from the backup. However, if backup of your data is not available, run a reliable LINUX recovery software to recover the data.

LINUX data recovery software are designed with powerful scanning algorithms that can recover any deleted, formatted or inaccessible data with ease irrespective of the data loss situation.

How to do Linux data recovery Post FSCK error

In a Linux system, any corruption or damage of the file system is dealt with running fsck utility. Though the utility repairs the corrupted file system, in some occasions, especially after an odd shut down, running fsck leads to more disastrous scenarios like data loss or inaccessibility of the hard disk. Sometimes, the situation is so worse that you have to recover the lost or inaccessible data from the valid backup or through any Linux data recovery software.

The Problem:

While working on a Linux OS, if there happens any file system corruption or damage, fsck utility is used to check for the error and fix it. However, at times, fsck fails and flashes error messages. The affected drive or volume remains inaccessible and the error messages, which keep flashing on the screen may be as below:

“CANNOT READ: DISK BLOCK block-number: I/O ERROR”

A brief about 'fsck': FSCK Error And Recovery

fsck is a system utility that comes with the Linux OS and is meant for checking, whether the file system is consistent or not. The utility can even repair the damaged or corrupted file system. Moreover, it interactively provides options to fix the damaged file system in a specified way or it automatically fixes specific problems without any user intervention. Usually, fsck is run by the system administrator, as the process of repairing by fsck can sometimes cause severe data loss and corruption.

Possible causes behind such problem:

The cause can be anything from a sudden power failure or electric power surge leading to an unsystematic system shut down.

Resolution:

The most possible way to successfully resolve the error  is to format the Linux system and make a fresh installation of the operating system. However, it is the data in the drive related to the troubled file system that holds more value than simply solving the error. Hence, in order to recover the inaccessible data from the drive or the volume, you need to take the help of any  Linux recovery software.

Linux data recovery software are advanced utilities, that are meant to recover back the corrupted, damaged, deleted or inaccessible data from any Linux based drive or volume. The software are developed with interactive GUI and are compatible with all most all currently available flavors of Linux OS.

Stellar Phoenix Linux data recovery

Disk label Corruption in Linux ! Solution Is here

The Linux operating system is very much similar to UNIX and has derived many basic design principles from it. Day by day, Linux OS has improved upon its previous versions and indeed has incorporated a number of distinguishable features over other operating systems. In Linux, disk drives are mounted through file system volume label and not the device path. This is a newer concept applied in Linux in order to avoid the ambiguity in distinguishing after a disk has been removed and some other have been inserted with the same device path. However, if there is corruption to the volume label, the situation becomes more complex, keeping the data from the drive completely inaccessible and a Linux data recovery utility is a must to recover the inaccessible data.  

To be a bit more elaborative, suppose, your system disk is at /dev/sda2. The system may have mapped another disk as /dev/sda2 and hence, your fstab, where all entries of the mounted disks are there, will be messed up making your system start improperly. At times, such issues can cause huge loss of data.

These kinds of situation may fire the command fsck automatically to check the Linux volumes each time the system boots-up. As fsck, checks for file system errors and tries to repair the same, it may take a significant amount of time. Any power surge or system crash during the process may cause serious system instability and data loss. This is an added problem that may further flash a warning message and further increase the chances that your Linux volumes become inaccessible. The message may read as below:

“Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)”

The warning message tells that the disk label has been corrupted and that is why the data in the drive is inaccessible. If running Disk Utility or fsck command fails, you have to restore the data from the backup. However, if backup of your data is not available, run a reliable Linux recovery software to recover the data.

Linux data recovery software are designed with powerful scanning algorithms that can recover any deleted, formatted or inaccessible data with ease irrespective of the data loss situation.

Among many names, Stellar Phoenix Linux Data Recovery is tried and appreciated by many users. The application can successfully recover your lost, formatted or inaccessible data from FAT32,FAT16,FAT12,Ext3,Ext4,Ext2 file system based Linux volumes.

Linux data recovery to undelete your lost or deleted data

Linux OS is popular for its robustness and advanced features. Like every other OS, Linux has its own style of naming different features and here, volume means the logical partition of the hard drive. A hard drive is divided into several logical volumes for a number of reasons such as multiple operating systems, keeping different categories separately etc. Though multiple hard disk volumes have many benefits, sometimes, the volumes get deleted, corrupted or inaccessible leading to the cases of huge personal as well as professional loss of data. Under such cases, you need to take the help of Linux file recovery to recover back your valuable data.

Different  volumes are loaded with different file systems and in Linux these volumes are dealt by a LVM. Every day, as we deal with many different kinds of data under different hardware and/or software environment, it is impossible to completely avoid data loss situations. Following are the reasons that can trigger the loss or inaccessibility of the logical volume:

1.  Virus attack or malware intrusion leading to corruption.
2.  Accidental or intentional deletion of partition/volume.
3.  Heavy power surge leading to file system corruption.
4.  OS Corruption etc.

All the above situations lead to the loss or inaccessibility of your valuable Linux data. As,  data loss is quite inevitable it is always advised to take regular backups and moreover, it is suggested to automate the backup process. But, it is not always possible to take backup of almost every piece of data and as, data loss events can accidentally happen at anytime, such data loss situations have always been a nightmare for many. However, the good thing is that any seemingly lost data can be recovered, until those are being overwritten by some other data. Above all, with the invention of technology like Linux file recovery, all your lost, deleted and even formatted Linux data can be recovered safely.

Linux  recovery tools are quite handy are designed with rich graphical user interfaces. The incorporated powerful algorithm and stepwise instruction set make enable the novice users user to without much hardship.

Hard drive failure: A lurking threat

A hard disk in one of the major components of a computer system, which has received great acceptance in both the personal and professional arenas. To fulfill the needs of growing data storage requirements, hard disk manufacturers have managed to evolve high capacity drives, and that too at affordable costs. Despite all these improvements, the fact remains that hard drives are mechanical devices which are bound to fail or crash inevitably. That's why computer users often come across dreadful data loss situations. Taking frequent backups considering the unpredictable lifespan of hard drives is certainly the way to go. But, the situations becomes grim if backups are not maintained. Fortunately, hard disk recovery can be acquired in case you do not have a valid or updated backup.

What are the signs of failure?

Disk recovery should become your immediate preference if you witness the following warning signals:

• Boot failure: If your system refuses to boot, this signifies the presence of bad sectors on your hard disks or corrupt master boot record.

• BSOD: If your encounter a blue screen with lots of error messages on your computer and it reboots automatically, this event is dubbed as 'blue screen of death.' If it appears regularly, the chances are your hard disk is about to fail.

• Strange noises: If you hear whirring, grinding or clicking sounds at regular intervals while your computer is running, then brace yourself for a mechanical hard drive failure. In such cases, it is best to get in touch with hard disk recovery experts timely.

What are the reasons behind failure?

A hard disk can render data inaccessible in many situations, which are broadly classified as logical, mechanical, electrical and firmware failure. Let's have a look at their brief descriptions:

Logical failure: It comprises of file system corruption, MBR corruption, accidental deletion/formatting etc.

Mechanical failure: This includes damage to the vital mechanical parts of a hard drive like read-write head, spindle motor, platters etc.

Electrical failure: Any damage to the PCB (Printed Circuit Board) due to power outages or spikes can make you a victim of data loss.

Firmware failure: If firmware gets damaged or corrupt, a hard disk and system cannot communicate.

What is hard disk recovery?

It is the task of recovering data from damaged, failed or corrupt hard drives. This job is done by experts with the help of specialized tools and in sterilized environment. Therefore, you must select a reputed data recovery company.

If you look around and do a little research on the Internet, you will find a number of data recovery companies vouching to offer superior data recovery services. However, if you want to get successful results, approach Stellar Information Systems Ltd for disk recovery. The company has a team of highly-experienced technicians, who have rich experience in tackling a variety of hard disk recovery jobs. CLASS 100 Clean Rooms is yet another essential facility which Stellar boasts of.

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Linux Data Recovery Software: to recover Linux data

Data Recovery is the process to recover data from corrupted, damaged or deleted files from OS. As we know, the possibility of the robustness and losing data in Linux based machine is less as it is more secure from virus infection/attack. But as we know in this world nothing is invincible, sometimes by human errors or software malfunction, you are not able to access your saved data from the file of Linux OS.

This means that your data is corrupted or lost. Now, to recover the lost or damaged Linux data, Linux Recovery tools are used. The need of Linux Recovery utility arrives only in few cases like- when Linux Hard disk not showing files & folders, OS get corrupted, Hard disk is formatted mistakenly

To Recover Linux files and Data, data recovery software performs the scan operations of whole hard disk to find out the missing files and folders. After finding missing files, folders data recovery software rearranges them into hierarchal structure  

These software’s are so User friendly that extra efforts or high end technical skills are not required to work on the software.

Use Disk Recovery Utility When a Damaged Boot.ini File is Disabling in XP

In the Windows NT and later systems, the boot.ini file is a very important file that is accessed when the system is booted. This file stores the critical information for the boot process such as the operating system that needs to be accessed, the active partition, and so on. If the file is damaged for some reason, then the system may not be able to start at all. There is an urgent need to repair the Boot.ini file for hard disk recovery failing which you must use a third-party disk recovery utility to recover hard disk.


Let us consider a scenario in which you are getting the following error message when you are booting your Windows XP system.

"Windows NT could not start because the following file is missing or corrupt:
Winnt_root\System32\Ntoskrnl.exe
Please re-install a copy of the above file."


Cause:

There could be the following reasons responsible for this startup problem:

- There is hardware failure in the hard disk.
- The Ntoskrnl.exe file is corrupt, damaged, or missing.
- The partition path entry in the Boot.ini file is incorrectly set.
- In the Boot.ini file, the Default value in the [Boot Loader] section is not found or incorrectly set.
- Windows XP is installed at a location, which is not saved in the Boot.ini file.


Resolution:

To resolve this erroneous situation, you can perform either of the following methods:

- Edit Boot.ini file: You should edit the boot.ini file to modify the [operating system] section and other entries such as the Default entry.
- Use Bootcfg utility: You should use the Bootcfg utility to correct the boot.ini file in the Recovery Console.
- Use chkdsk utility: You should start the system in the Recovery
- Console and run the chkdsk tool with the following syntax:
CHKDSK /r


Use Windows XP Setup CD: To do this, you should perform the following steps:

- Boot the system with a boot Windows XP Setup CD.
- In the Recovery Console, press the 'R' key to repair the existing system files.
- In the Command Prompt, enter the following command and press the 'Enter' key:
- Expand :\i386\ntoskrnl.ex_ :\Windows\system32\ntoskrnl.exe
- Press the 'Y' key if there is a prompt to overwrite the existing file.
- Type 'exit' to quit Recovery Console.


Restart the system.

If you are unable to start the system even after performing these methods, then you should resort to using a third-party disk recovery utility to recover hard disk. With the ability to recover all the data safely, such disk recovery tools possess highly interactive user interface that make the process very easy.


The best Hard Disk Recovery software that recovers data from exFAT, FAT, and NTFS file partitions is Stellar Phoenix Windows Data Recovery. Capable of recovering data from various storage devices such as iPods, memory cards, hard disks, etc, this disk recovery utility is compatible with Windows 7, Vista, Server 2003, XP, and 2000.

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Software to recover Data loss in Linux Drive

Among the tech geeks, Linux OS based computers are considered more robust and safe From Data threats, as the Linux versions are more often updated with technology changes. Moreover, their frequent upgradation, Helps them to stay comparatively free from virus/ malware intrusion. These are the few points backing the Linux systems against some of the usual problems and thereby loosing valuable data. However, hard drive of a Linux based system, the major physical component that stores the data, can go wrong to take down significant amount of data with it. Such situation demands techniques, such as Linux hard drive recovery to recover back your valuable data from the troubled or damaged drive.

Inside view of Linux hard drive:
A hard drive consists of several mechanical and electromechanical components, such as head, platter, motor, PCB etc. Be it a mechanical failure, electronic failure, firmware failure or any logical failure, if your hard disk fails due to any of the reasons, the data contained in it becomes inaccessible. In a number of occasions, the hard drive doesn't have any physical problem and due to some logical errors, such as virus/malware infection, formatting, file system corruption or operating system malfunction, the data in the drive remains in accessible .

How to keep hard drive Safe:
Never try to open your damaged linux drive under any instance of data loss. Furthermore, never try coping new files, fragmenting etc, as the data inside the disk may get overwritten and hence, will go beyond the scope of recovery. Moreover, remember that, the data in the drive is never permanently lost and it can be safely recovered by the help of Linux hard drive recovery technology.

Advanced OS like Linux have inbuilt commands that can detect and repair errors to make your hard disk into working condition. 'fsck' is such a command, which helps to scan the Linux drive for any possible corruption or damage and repair the same in order to recover the data. However, if the command fails, you have to restore your data from the updated backup, failing to which only one option is left to recover your invaluable data, that is to run a Linux data recovery software.

These Linux recovery software are well advanced in their mechanism to dig into your troubled Linux hard drive and recover your data irrespective of the hard disk type, make or model. Moreover, the operation is so simple that you needn't have to worry a little.

Write-back caching techniques In Linux and data loss.

In digital world, every single day, we can witness a new technological advancement, even over the advanced of the things. The 'caching' technique is one of the instances that has been devised to increase the efficiency and speed of the system. Through caching, data can be temporarily stored in the virtual memory before it is being written to the disk and can be accessed much faster. Sometimes, in Linux machine, caching causes severe corruption to the file system and your data in the affected drive becomes  inaccessible. These instances of data loss can be countered and the recovery of your valuable data is required.

The problem:
While writing to a disk using the Write-back caching technique, the system shuts down followed by a power surge. The situation resulted in severe system error and some data in the drive went missing or inaccessible.

A brief about 'Caching':
In general, caching is a process of storing data that has been computed earlier or is frequently needed by the system. Furthermore, if certain process is triggering the same set of instructions for transferring data, then storing the data or the instructions in RAM can significantly increase the performance of the whole process. Data in the cache can be accessed much faster. There are several caching techniques based on the Write policy and Write-back caching is one of them.

In case of Write-back caching, data is not immediately mirrored to the storage device, the cache retains the data until it is fully read. The next step is to find the space for writing and cache marks the same as 'Dirty', then finally it writes the whole data from the buffer cache.

This techniques of caching has been implemented in a number of RAID controllers and is supported by most of the microprocessors. Problem is more prominent in case of non-journaled file systems, where information is directly written to the file system. If a write process has started, but not properly finished due to any improper shut down or hardware failure, the cache memory cannot be flushed to the specified location in the disk. Thus, the file system gets corrupted resulting the loss or inaccessibility of the corresponding meta data.

In these situations, the lost data can be recovered from the updated backup. Still some currently processed data can never be recovered as the file system corruption needs to be addressed with formatting and fresh partition. Moreover, if backup is not available, the situation becomes more worse and you don't have any other option except to look for  Linux file recovery software to recover lost data .