“Journaling” is a file system feature that assists to protect a file system alongside hardware failure or power outages, decreasing the necessity for repairs. A Journaled file system preserves a journal of the modifications it means to make, by time. After a system crash, recovery usually involves replaying modifications from this journal in anticipation of the file system get in a consistent state.

A journaled file system is a fault-elastic file system in which the data integrity is guaranteed as updates to bitmaps and directories are continually written to the serial log on disk ahead of the original disk log is reorganized.

In case of a system failure, the full journaling file system guarantees that the data on the drive has been restored to its pre-crash configuration. This also recovers unsaved data and saves it to the location where it will have gone if the computer hadn’t crashed, making it a vital feature for mission critical data and applications.

The journaling technology of all the file systems is not same. Windows NT provides a less strong version of the complete system. Whereas Ext3 file system uses complete journaling. There are two kinds of journaling concepts used by the file systems:

 Physical Journaling
 Logical Journaling

Most of the computer users think that due to journaling, file systems are secluded against power and hardware failures. It is factual that journaled file systems are more powerful than those without, but it should be clear from now that there are some things the journaled file system can’t protect against.

You are susceptible to data loss in case of power failure when using journaled file system. The reason behind this is the hard drives are block devices. Generally, if a number of bits are flipped as you write them to disk, you could take benefit of properties intrinsic in the data to retrieve it. At least, you only lose a bit of the block. Should the data block trashed and encrypted as it is written, the flipped bit would result decryption of that block to fail, so it is the entire loss.

The problem only occurs with the logically journaled file systems. The difficulty with logical journaling is that if you do have an unexpected power failure or system shutdown, and the data storage system doodles garbage on the file system table, there is no method to recover. The only thing, that is left, to restore your data from backup.

These data loss situations are really very critical for organizations and can put them out of the business. The only thing that you can do here is to use data recovery tools and get your data recovered. The data recovery tools for such circumstances are known as data recovery software. The data recovery software are different for different operating systems and file systems.

Stellar information systems Ltd is a data recovery company with an exclusive track record of providing outstanding data recovery software. The data recovery software are available operating systems like Windows, Macintosh, UNIX, Linux and Novell and all the corresponding file systems.

The data recovery becomes tremendously simple and straightforward with these data recovery software due to their user friendly interface and effective data recovery technique. The efficiency of the data recovery software has been measured and proved in most of the cases of data loss.