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2. Hard disk drive failure - Wikipedia

   en.wikipedia.org/wiki/Hard_disk_drive_failure

   A hard disk drive failure occurs when a hard disk drive malfunctions and the stored information cannot be accessed with a properly configured computer. A hard disk failure may occur in the course of normal operation, or due to an external factor such as exposure to fire or water or high magnetic fields , or suffering a sharp impact or ...

3. TestDisk - Wikipedia

   en.wikipedia.org/wiki/TestDisk

   TestDisk is a free and open-source data recovery utility that helps users recover lost partitions or repair corrupted filesystems. [1] TestDisk can collect detailed information about a corrupted drive, which can then be sent to a technician for further analysis.

4. Data recovery - Wikipedia

   en.wikipedia.org/wiki/Data_recovery

   Depending on the situation, solutions involve repairing the logical file system, partition table, or master boot record, or updating the firmware or drive recovery techniques ranging from software-based recovery of corrupted data, to hardware- and software-based recovery of damaged service areas (also known as the hard disk drive's "firmware ...

5. Bad sector - Wikipedia

   en.wikipedia.org/wiki/Bad_sector

   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.

6. Data corruption - Wikipedia

   en.wikipedia.org/wiki/Data_corruption

   Many errors are detected and corrected by the hard disk drives using the ECC codes [17] which are stored on disk for each sector. If the disk drive detects multiple read errors on a sector it may make a copy of the failing sector on another part of the disk, by remapping the failed sector of the disk to a spare sector without the involvement of ...

7. CHKDSK - Wikipedia

   en.wikipedia.org/wiki/CHKDSK

   It verifies the integrity of the file system on a volume (usually a partition) and attempts to fix logical file system errors. Logical errors are typically defined as software-level problems with a filesystem (or its metadata ) as a result of prior software malfunction (e.g. crashes) or irregular use (e.g. hard resets).