Linux Community Magazine

CRC (Cyclic Redundancy Check) is the standard check process that different files use to detect corruption inconsistencies, if any. Using this check, Linux systems ensure that kernel image hasn't changed after it was built. If system finds any mismatch between the original and current value, it doesn't proceed further while booting and eventually the system halts. Data becomes inaccessible and to restore lost information, you need to use your recent data backup. But if it gives errors or is found as incomplete or damaged, Linux Data Recovery applications can be used for data recovery. You might encounter the following error message when trying to boot your Linux-based computer:"CRC error - System Halted"This error message occurs immediately after system prompts: 'Uncompressing Linux'. System doesn't boot up and you cannot use CTRL-ALT-DEL key to reset the system.CausePossible causes of the above issue to occur are:* Kernel image is stored on bad sectors. When Linux kernel i mage gets uncompressed, it runs a CRC check to ensure its integrity. If checksum values don't match, it gives errors, as above. * Bad hard drive* Bad hardware components like system memory or CPU cache* File system issuesSolutionYou should follow these methods in order to fix this problem:* Use Live CD to boot your system. After this, you need to copy the kernel image from the bootable disk and delete the existing kernel image. Rename the copied image to the one that boot loader recognizes. If you use LILO (LInux LOader), you should run /sbin/lilo to translate present location of copied image to disk geometry language and write to partition's boot sector.* Backup all the possible data and replace the bad hard drive* Diagnose and replace the damaged hardware components* Run fsck, if file system is dirty* If problem persists, reformat the hard drive and restore from backupDisk formatting deletes all the existing information and if you observe any issues with your backup, you c an use Linux Recovery tools. These are effective Linux Data Recovery software that restore lost information using powerful and safe scanning algorithms. Stellar Phoenix Linux Data Recovery is an optimum tool to locate and recover lost data. It supports Ext2, Ext3, and ReiserFS file systems. This Linux Recovery tool provides advanced features including Disk Imaging, RAW File Recovery, File Filer etc. The application is compatible with most of the Linux distributions, like Red Hat, SlackWare, Turbo Linux, Sorcerer, SUSE etc.