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The most common data recovery scenarios involve an operating system failure, malfunction of a storage device, logical failure of storage devices, accidental damage or deletion, etc. (typically, on a single-drive, single-partition, single-OS system), in which case the ultimate goal is simply to copy all important files from the damaged media to another new drive.
Data corruption can occur at any level in a system, from the host to the storage medium. Modern systems attempt to detect corruption at many layers and then recover or correct the corruption; this is almost always successful but very rarely the information arriving in the systems memory is corrupted and can cause unpredictable results.
Hard disk reader. A bad sector in computing is a disk sector on a disk storage unit that is unreadable. Upon taking damage, all information stored on that sector is lost. When a bad sector is found and marked, the operating system like Windows or Linux will skip it in the future.
SpinRite was originally written as a hard drive interleave tool. [3] At the time SpinRite was designed, hard drives often had a defect list printed on the nameplate, listing known bad sectors discovered at the factory. In changing the drive's interleave, SpinRite needed to be able to remap these physical defects into different logical sectors.
Upon realizing data loss has occurred, it is often best to shut down the computer and remove the drive in question from the unit. Re-attach this drive to a secondary computer with a write blocker device and then attempt to recover lost data. If possible, create an image of the drive in order to establish a secondary copy of the data.
Redo Rescue, formerly Redo Backup and Recovery, is a free backup and disaster recovery software. It runs from a live CD, a bootable Linux CD image, features a GUI that is a front end to the Partclone command line utility, and is capable of bare-metal backup and recovery of disk partitions. It can use external hard drives and network shares.