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2. Standard RAID levels - Wikipedia

   en.wikipedia.org/wiki/Standard_RAID_levels

   Diagram of a RAID 1 setup. RAID 1 consists of an exact copy (or mirror) of a set of data on two or more disks; a classic RAID 1 mirrored pair contains two disks.This configuration offers no parity, striping, or spanning of disk space across multiple disks, since the data is mirrored on all disks belonging to the array, and the array can only be as big as the smallest member disk.

3. CHKDSK - Wikipedia

   en.wikipedia.org/wiki/CHKDSK

   On Windows NT operating systems, CHKDSK can also check the disk surface for bad sectors and mark them (in MS-DOS 6.x and Windows 9x, this is a task done by Microsoft ScanDisk). The Windows Server version of CHKDSK is RAID-aware and can fully recover data in bad sectors of a disk in a RAID-1 or RAID-5 array if other disks in the set are intact. [11]

4. RAID - Wikipedia

   en.wikipedia.org/wiki/RAID

   RAID (/ r eɪ d /; redundant array of inexpensive disks or redundant array of independent disks) [1] [2] is a data storage virtualization technology that combines multiple physical data storage components into one or more logical units for the purposes of data redundancy, performance improvement, or both.

5. Nested RAID levels - Wikipedia

   en.wikipedia.org/wiki/Nested_RAID_levels

   As a RAID 0 array striped across RAID 5 elements, minimal RAID 50 configuration requires six drives. On the right is an example where three collections of 120 GB RAID 5s are striped together to make 720 GB of total storage space. One drive from each of the RAID 5 sets could fail without loss of data; for example, a RAID 50 configuration ...

6. DMDE - Wikipedia

   en.wikipedia.org/wiki/DMDE

   DMDE (DM Disk Editor and Data Recovery Software) is a data recovery and disk editing tool for hard drives and other storage media. It can work with physical devices, logical disks, disk images, as well as RAID-arrays and recovers files that have been accidentally deleted or lost due to other incidents. [1] [2] DMDE is available in various editions.

7. Error recovery control - Wikipedia

   en.wikipedia.org/wiki/Error_recovery_control

   The result is increased reliability in a RAID array. In a stand-alone configuration TLER should be disabled. As the drive is not redundant, reporting segments as failed will only increase manual intervention. Without a hardware RAID controller or a software RAID implementation to drop the disk, normal (no TLER) recovery ability is most stable.