Having been duplicated, the data can be recovered from damaged, failed, corrupted or inaccessible secondary storage media when it cannot be accessed normally. The data are often being salvaged from storage media such as hard disk drives , storage tapes, CDs, DVDs, RAID and so on. Backup may be required for recovery 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 .

 

Recovering data after physical damage

A wide variety of failures can cause physical damage to storage media. CD-ROMs can have their metallic substrate or dye layer scratched off; hard disks can suffer any of several mechanical failures, such as head crashes and failed motors; tapes can simply break. Physical damage always causes at least some data loss, and in many cases the logical structures of the file system are destroyed as well. This causes logical damage that must be dealt with before any files can be salvaged from the failed media.

Most physical damage cannot be repaired by end users. For example, opening a hard disk in a normal environment can allow airborne dust to settle on the platter and become caught between the platter and the read/write head, causing new head crashes that further damage the platter and thus compromising the recovery process. With AyBackup at hand, you can backup your important data as you want.

 

Recovering data after logical damag

Logical damage is primarily caused by power outages that prevent file system structures from being completely written to the storage medium, but problems with hardware (especially RAID controllers) and drivers, as well as system crashes, can have the same effect. The result is that the file system is left in inconsistent crashes, or an actual loss of data. Various programs exist to correct these inconsistencies AyRecovery Professional , for instance, and most operating systems come with at least a rudimentary repair tool for their native file systems. Third-party utilities such as The Coroners Toolkit and The Sleuth Kit are also available. Even deleted data is also considered to be logically damaged drive for example due to virus attack, if you format the drive or accidental deletion.

 

 

 

 

 

 

 

 

 

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