The Anatomy of RAID Failure and its Recovery

RAID (Redundant Array of Independent Disks) was developed to meet the three crucial challenges of modern data storage needs.

  1. Capacity
  2. Performance
  3. Fault tolerance or Redundancy


The technology becomes popular right from the beginning, but more organizations and individuals start using it with the introduction of RAID 5, a level of RAID, so called and was perfectly meeting all three needs of modern data storage. In short, we can say, in RAID 5, it is possible to use unlimited no. of disk drives to increase the data storage capacity (First need to be met). Then comes the performance, RAID 5 is the best cost/performance RAID configuration for transaction-oriented networks with a support of multiple simultaneous read/write requests & optimization capability for large and sequential requests (Second need to be met). While talking about fault tolerance, it uses the concept of distributed parity bit across the data drives and can tolerate the fault when a single drive in the array fails (Third need to be met).

Why RAID 5?

After RAID 5, some other levels were also introduced with higher performance and fault tolerance capability, but the cost/performance factor makes the RAID 5 configuration be most used for the purpose of data warehousing, data backups, web archiving & basic file servers. It is by far the most common RAID configuration level used in the enterprise NAS devices and business servers.

But now the question arises, why more levels of RAID were developed?

The scope of Improvements remains always and so the case was with RAID 5. This level of RAID was able to tolerate only the single disk failure & was more vulnerable to data loss. The later RAID configuration levels were faster & more redundant, but were too costly to be affording by the individuals and small businesses. So, the RAID 5 still remained the most widely used configuration, though, being assembled of several electronic components, it too fails and below are the most common reasons of RAID failure:

  • Logical corruption or failure
  • Rebuild failure
  • Accidental/intentional formatting or deletion
  • Hard drive failure
  • RAID controller failure
  • Corrupted file system or bad sectors in hard drives

And, all reasons of RAID failures lead to the loss of your important data/files stored in the hard drives connected in the array. In this situation, it becomes critically important for you to recover those precious files and data from the RAID array and can only be made possible by a RAID recovery software program. To tackle the issue of data recovery from RAID, Stellar comes up with an advanced & feature rich software, Stellar Data Recovery Technician.

Below are the unique features of the software:

  • A clean and easy to understand user interface.
  • Capable of efficient recovery of all important data from RAID 5 logical failure.
  • Raw recovery of RAID hard drive volumes even without the presence of RAID controller.
  • Recover data from storage media with bad sectors by creating its image.
  • Capable of data recovery from formatted or repartitioned RAID hard drives.
  • Can recover the data from logically corrupted or inaccessible RAID array.

But, the two amazing features of RAID Recovery Software from Stellar is most important to the RAID users are:

  1. You can recover the RAID data even if you have forgotten/lost all the RAID parameters such as strip size, parity order, parity delay etc. It can automatically detect all the parameters upon selecting “Don’t Know” option in the software.
  2. Virtual RAID construction is one of the most innovative and unique features of the software which allow the users to create a virtual RAID using the software and perform raw recovery from lost volumes.

Other options in the software such as drive status check, optical media recovery, drive recovery from windows system; recovery from image, photo recovery can be invaluable to many users.

Free download

  1. Mozelle June 28, 2017
    • Jyoti Prakash June 29, 2017
  2. Aaron Scott November 11, 2016
  3. Charles Davis October 21, 2016
  4. Allen K October 7, 2016
  5. Lery Chair July 22, 2016
  6. Peter Nesci June 14, 2016

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