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Reconstructing a Broken RAID or Spanned Volume

Use this dialog to reconstruct a broken RAID or spanned volume. Do not use it if the volume is not broken even if it has been reformatted or become corrupted. For more information please read:

What is a Broken RAID?

Recovering Software-Based RAID.

Recovering Hardware-Based RAID.

Recovering NAS device.

RAID Analysis Service.

Spanned Volume

Select this option to reconstruct a spanned volume.

Striped Volume (RAID 0 or RAID 5)

Select this option to reconstruct a RAID.

With Parity (RAID 5)

Select this option if the volume is a RAID 5. If RAID 0, leave this box unchecked.

Original number of disks

Enter number of disks in the original RAID. For RAID 0 all original disks must be available. For RAID 5 one disk can be missing but must be included in this count.

RAID 5 Parity rotation

Warning: This section provides general guidelines. The parity rotation used by a particular manufacturer is subject to change without notice.


The parity block is rotated from the first disk to the last disk. This rotation has been observed on older RAID controllers.


The parity block is rotated from the last block to the first block. This has been observed on the Dell MegaRAID®, HP (formerly Compaq) controllers and many new controllers. (Please read the warning above.)

Backward, symmetric

Select this option if a software-based RAID 5 was originally created on a computer running Windows Server 2000 or later. Many new hardware RAID controllers also adopt this rotation scheme to equally balance the loads on all disks.

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