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Wednesday, 21 July 2021

Standard - 6 Home Learning Video-2021-22

Standard - 6 Home Learning Video-2021-22


Standard - 6 Home Learning Video-2021-22.Data recovery can be defined as a process of obtaining the information located on a storage device that cannot be accessed by the standard means due to its previous deletion or certain damage to the digital medium. Different approaches are used to regain the missing files, yet, only on the condition that their content is present somewhere within the storage. For instance, data recovery doesn't cover the situations when a file has never been written to a persistent storage, like documents that were created but could not be eventually saved to the hard disk drive due to a power failure.


Also, none of the existing recovery methods can cope with the cases of permanent erasure of data which occurs when some other information occupies its storage space – under such circumstances, the lost files can only be restored from an external backup.


In general, data recovery techniques are divided into two types: software-based and ones involving the repair or replacement of the damaged hardware components in a laboratory setting. A software-based approach is employed in the majority of cases and involves the use of specialized utilities able to interpret the logical structure of the problem storage, read out the required data and deliver it to the user in a usable form for further copying.


Physical repairs are conducted by specialists in the most severe instances, for example, when some mechanical or electrical parts of the drive no longer work properly – in this case, all the measures are directed towards a one-time extraction of the critical content, without the possibility of continued usage of the affected device.


By and large, the overall success of a data recovery procedure depends heavily on the choice of the right recovery method and its timely application. That is why it is highly important to understand the nature of the data loss instance and know what can be done in each specific scenario. In contrast, the wrong actions can lead to the irreversible destruction of the information.


File system formatting can be started by mistake, for example, as a result of specifying a wrong disk partition or on account of mishandling a storage (e.g. NAS devices usually format the internal storage after an attempt to reconfigure RAID).


The formatting procedure creates empty file system structures on the storage and overwrites any information after that. If the types of the new and the former file systems coincide, it destroys the existing file system structures by overwriting them with new ones; if the types of the file systems differ, the structures are written to different locations and may wipe the user data.


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