Linux data recovery: Unable to Access Linux Volumes

This is possible in Linux OS to install and run the system software on a single hard disk partition. Such type of configurations are easy to establish and use. But if you divide your Linux hard disk into multiple volumes, you can effectively manage your critical data and get several other benefits. But in some situations, you might encounter I/O errors while accessing logical hard drive volumes and they become inaccessible. This behavior of Linux machine results into  loss of important data .

While this is true that Linux OS would work fine on the hard disk with only one large volume , but there are several benefits of dividing the hard disk into at least four volumes vis. home, root, swap and usr. The major benefits of partitioning the hard drive are as listed below:

First, it helps you to reduce the time  period required  to carry out file system checks , because these checks can be performed at the same time. With several partition, it is quite easy to perform checkup.

Second, with many volumes, you can mount one or more of the volumes in read only mode. For example, when you consider that everything in the /home directory would not be touched even by the root, you can mount home in read only mode.

Finally, the most important advantage that hard disk volumes provide is absolute data protection. If anything goes wrong with your Operating system  and you've to format the primary volume and then reinstall OS. All of the data stored in secondary volumes would remain safe.

Although, this is quite useful to create several hard disk volumes, but in some situations the volumes might become inaccessible and you may encounter error messages while opening them. As an example, while accessing Linux hard disk volume, you may come across below error which put you in need of Linux data Recovery:

“[ 234.284559] Buffer I/O error on device f 60. Logical block 0

[ 272.376782] Buffer I/O error on device f 60. Logical block 0”

In these cases, Linux recovery  Software helps you to recover lost data. These software perform Data Recovery of Linux by thoroughly scanning affected hard drive using advanced scanning mechanisms.

what to do when partitioning causes failure of FSCk

Stellar Phoenix Linux Data recovery

Hard disk in a Linux machine can be divided into primary, logical, swap, or foreign partitions. These partitions are assigned a pre-defined space at the time of installation of the Linux OS. However, as the requirements of the user change with a passage of time, the users increase or decrease the size of these partitions accordingly. To do so, the users either opt for FDISK utility or any third party software. 

While the process of re-partitioning allows the user to fulfill all partitioning requirements, it might also result into complete unmountability of the hard disk, if not performed systematically. In most of these situations, the user encounters an error message that does not allow him/her to access the data saved on any of the hard drive partitions. To overcome such error messages, the user needs to opt for an effective third-party Linux partition Recovery application, if s/he has not maintained any backup.

Consider a practical scenario to illustrate the above case. You have three primary partitions and one extended partition in your Linux based hard dsik. You use a third-party utility to delete the extended partition and allocate all the space to one of your primary partition. However, after you have done so and you reboot your system, you encounter the below error message:

“Loading console font lat9w-16.psfu -m trivial (K
fsck failed. Please repair manually and reboot. The root
file system is currently mounted read only. To remount it
read write do:
bash# mount -n -o remount,rw /
Attention: Only CONTROL-D will reboot the system in this
maintenance mode. shutdown or reboot will not work.
Give root password fol login:”

The above error message appears at the booting time and makes all the hard disk partitions inaccessible.

Cause of the error:

The above error message occurs when file system corrupts due to improper partitioning by third-party partitioning utility.

How to resolve:

To get past the above file system corruption error message and access the data, follow the below guidelines:

Run the FSCK command to repair the file system.

Reinstall the OS and restore the data saved from an updated backup. However, if in case no backup is available, then you will need to use a commercial Linux Partition Recovery software. Such Linux data Recovery software use advance scanning algorith to scan the deleted files data from all the partitions.

Linux partition Recovery software When damage occurs in Partition Table

Stellar linux data recovery

Now a days dual boot option is available in virtually every PC this is also known as Multi-boot. this facility enables you to use features of different operating systems while working independently on them.  Dual booting has lots of benfet but some time it may cause serious problems too you may even face serious data loss situations. At this point of time, it become essential to look out for Linux Recovery to get your important data back.

It may happen that the partition table gets corrupted causing loss of data the loss of partition table itself cause the loss of data stored in a particular drive


Partition table is the most important data structure of Linux OS that stores important information about hard disk partitions. This information is required by the OS to access hard disk partitions. In case of damage to the partition table, all of your critical data gets deleted and you need Linux partition Recovery to get your data back.

How to do linux recovery when the module cannot be located

While working on a Linux based computer system, sometimes, at the start-up or during the shut down, the system suddenly starts behaving abnormally. In the due course, an error message gets flashed on the screen and the system hangs. As all your data lying with the hard drive of the troubled system remains inaccessible, you have to look for any Linux data  recovery software to recover them back.

The system processes that are related to the booting process and the shut-down process have been terminated and the error message pops up on the screen leaving the system hanging at that point. The error message that gets flashed on the screen can be read as below:

"Can't Locate Module "

Cause:

The error is quite clear and it is due to the unavailability of modules to the files modprobe, insmod or rmmod. The result is that the required system files could not be accessed by the system and hence, failed to boot or shut down. There is a fare chance of possibility that the discussed system files are corrupted and the reason may be sudden or unsystematic shut down, virus attack, file system corruption etc.

Modprobe is a system file which looks in the module directory "/lib/modules/uname -r" and adds or removes the modules intelligently. Insmod is meant for taking modules from the standard input and inserts them in the Linux kernel. The problem occurs when insmod tries to link the modules inside the Linux kernel. Rmmod works to upload the modules that can be loaded from the running Linux kernel, with certain yardstick, such as currently, neither the modules are in use nor they are referred by any other.

Resolution:

In the above discussed problematic situation, in order to resolve the issue, you have to format the partition and install the operating system once again. Formatting will erase the data from the drive and you have to restore it from the previously taken backup. However, if some data is yet to be backed up, it is best suggested to use Linux module recovery software to recover back all your lost or inaccessible data as a whole without taking much risk.

Linux partition Recovery: Resizing Linux Partition caused data loss

In Linux,there are various file systems, such as ext2, ext3, ext4 etc. File systems are used to store and manage files on the logical partitions of a drive. For the convenience of storage and easier access of data, we used to make different file system based partitions for different categories of data. We create partitions of varied sizes and sometimes we need to resize the partitions. Resizing the partitions manually, following the formatting of the old partition or through any third party tool, may result in serious data loss. Under such instances of data loss, you badly need any Linux partition recovery utility to recover them back.

Need to resize a particular partition is quite genuine. For example, suppose that the partitioned volume is big and with time, it has saved a large amount of data. As it is affecting the accessing speed, you may think to trim the unnecessary part, so that it may enhance the search or access efficiency. Another possible reason behind partition resizing is if the amount of a particular category of data is more than the specified partition can store.

Whatever be the reason, if your Main aim is to resize the partition, you can do so by increasing or decreasing the size of the partition. There are two methods, one is to delete the partition after formatting it and then repartition, giving the the size of the partition, you want. Secondly, you can use any third-party partition resizing and recovery tool that can facilitate dynamic resizing of the partition.

If you choose to the option to format and delete the old partition  and resize it, then you should take backup of the important data from the drive, as formatting will wipe out all the data from it. Later, you can restore the data from the backup server.

It is safer to use any resizing utility, however, sometimes, the process of trimming some memory from one disk and adding it to another may also cause data loss.
Hence, it is always advised to take backup of your critical data prior to such resizing process. However, if you have not taken backup or due to any error, couldn't restore data from the backup, then the only possible way to recover your valuable data from the Linux partition is  to run any Linux parttion recovery software.

File System Corruption and recovery options in linux

File system check  or fsck is a system utility that checks the consistency of the file system in Linux and all UNIX like OS. Once, the system detects any inconsistency in it, following any unsystematic system shut down, this tool runs automatically at the booting process. The fsck tool facilitates repairing of the file system as specified by the user or else, it can do the on its own automatically. However, sometimes, fsck also fails to fix certain errors and the data in your Linux disk become inaccessible thereafter. In such cases, you need to look for any Linux recovery utility to recover back your valuable data.

Usually, in case of an odd shut down of the Linux system following any power surge or power failure, the process of read or write is interrupted all of a sudden and hence, there happens a corruption to the directory block that stores the information about the data. The fsck locates such inconstancy with flashing error messages, following which the system even fails to boot-up. The error messages shown by fsck are as follows:

It seems to have fatal corruptions. Running with

--rebuild-tree is required.

*ev/sda1: clean 33/522240 files, 80815/1044193 blocks [fail]

* fsck failed. Please repair manually.

All the error messages point towards a single thing that there is a serious corruption to the file system and may be due to the same, the operating system is not able to access the boot sector of the computer.

Whatever be the data loss situation, it is important to recover the data from the drive first. Hence, once fsck fails to repair the corruption and the data remains inaccessible, the best option is to restore your data from the backup. However, if backup is not available or failed to restore the data from the backup server, try running any Linux FSCK error recovery software.

Linux file recovery software are designed to recover and restore the lost or inaccessible data from any Linux based drive irrespective of the data loss situation. These applications provide rich graphical user interface and stepwise instruction set, which facilitate a smooth recovery experience to the users.