General Discussion - Learn More about Data Recovery maryning - Wed Jun 23, 2010 5:17 pm Post subject: Learn More about Data Recovery
Learn More about Data Recovery
We lost data in many different ways. At that time, we need data recovery software. But many people will ask that, what is data recovery software? Why we need data recovery software? What data recovery software can do?
Fail to save files, accidentally delete files, virus attacks your computer or computer system crashes, all these situations may cause the loss of data even we have fire wall, anti-virus software and a wide range of data backup software to protect files. Whichever you suffered, the losses are unbearable to you. But data recovery can take all the regret and upset away.
Data recovery is the process of salvaging data from damaged, failed, corrupted, or inaccessible secondary storage media when it cannot be accessed normally.
Often the data are being salvaged from storage media such as hard disk drives, storage tapes, CDs, DVDs, RAID, and other electronics. Recovery may be required due to physical damage to the storage device or logical damage to the file system that prevents it from being mounted by the host operating system.
The most common "data recovery" scenario involves an operating system failure (typically on a single-disk, single-partition, single-OS system), in which case the goal is simply to copy all wanted files to another disk. This can be easily accomplished with a Live CD, most of which provide a means to mount the system drive and backup disks or removable media, and to move the files from the system disk to the backup media with a file manager or optical disc authoring software. Such cases can often be mitigated by disk partitioning and consistently storing valuable data files (or copies of them) on a different partition from the replaceable OS system files.
Another scenario involves a disk-level failure, such as a compromised file system or disk partition or a hard disk failure. In any of these cases, the data cannot be easily read. Depending on the situation, solutions involve repairing the file system, partition table or master boot record, or hard disk recovery techniques ranging from software-based recovery of corrupted data to hardware replacement on a physically damaged disk. If hard disk recovery is necessary, the disk itself has typically failed permanently, and the focus is rather on a one-time recovery, salvaging whatever data can be read.
In a third scenario, files have been "deleted" from a storage medium. Typically, deleted files are not erased immediately; instead, references to them in the directory structure are removed, and the space they occupy is made available for later overwriting. In the meantime, the original file may be restored.
Although there is some confusion with the term, the term "data recovery" may be used to refer to such cases in the context of forensic purposes or spying.
