Data Recovery is the removal of inaccessible, lost, damaged, corrupted, or formatted data from secondary storage, removable media, or files when the data stored in them cannot be accessed in the normal manner. It usually saves data from media such as internal or external hard disk drives (HDDs), solidstate drives (SSDs), USB flash drives, magnetic tapes, CDs, DVDs, RAID subsystems and other electronic devices. Recovery may be required due to physical loss to the storage devices or logical damage to the file system that prevents it from being installed by the host operating system.
The most common data recovery scenarios are operating system failure, , logical device failure, storage device failure, accidental damage, or deletion, and so on. (Usually on a singledrive, singleoperating system, singlepartition ), in this case, the ultimate goal is to copy all important files from the damaged media to another new drive. This can easily be accomplished by using a live CD or DVD, booted directly from the ROM, instead of the damaged drive in question. Many live CDs or DVDs allow you to mount the system drive and backup drives or removable media, and move files from the system drive to the backup media using a file manager or optical disc burning software. Such cases can often be reduced by disk sharing and the continuous storage of valuable data files (or copies thereof) on a partition other than the system files on the removable operating system.Here the question is How to Restore Lost Files?
The most common causes of data loss are related to our daily lives – the way data is saved, stored, and managed.
There are four Phases of recovery which are as follows:
Four Phases of Data Recovery:
There are usually four stages to successful data recovery, although this can vary depending on the type of data corruption and recovery.
Phase 1: Repair the hard disk drive
The hard disk is repaired in order to function in some form, or at least in a state that is suitable for reading data. For example, if the head is bad, it needs to be replaced; if the PCB is defective, it must be repaired or replaced; if the spindle motor is bad, the plates and heads must be moved to a new drive.
Phase 2: Download the drive to a new drive or a disk image file
If the hard disk drive fails, removing data from the drive is a top priority. The longer you use a faulty drive, the more likely it is that further data loss will occur. Imaging the drive ensures that there is a secondary copy of the data on another device on which it is safe to perform testing and recovery procedures without damaging the source.
Phase 3: Logical recovery of files, partitions, MBRs, and file system structures
Once the drive has been cloned into a new drive, it is suitable for retrieving lost data. If the drive is logically faulty, there are several possible causes. Using the clone, we can repair the partition table or master boot record (MBR) in order to read the data structure of the file system and the stored data.
Phase 4: Repair the recovered corrupted files
Data corruption can occur if, for example, a file is written to a sector of a drive that is damaged. This is the most common cause of faulty drives, meaning data must be reconstructed for readability. Damaged documents can be recovered using a variety of software methods or by manually reconstructing the document with a hexadecimal editor.