RAID File Recovery & RAID Failure

This page guide you to recover files from RAID array because of RAID hardware failure, RAID controller failure, RAID drive failure, formatting, etc.

Table of Contents

Reasons for RAID File Loss

RAID is a method of combination of a few hard drives into on inexpensive disk, which provides fault-tolerance for data storage. RAID array provides safer solution for data storage than basic hard disk to protect against data loss, but the loss is usually huge and serious once there is any problem with RAID array.
Data stored on RAID array probably gets lost due to human mistake, RAID failure and system problems and more:

We will introduce data recovery solution for RAID at first, and then we will introduce solution for all common RAID failures later in this article.

Free Download Software for RAID File Recovery

download data recovery software

For any reason that causes RAID data loss, iCare Data Recovery Pro offers a good way to retrieve files from RAID.

Step1. Free download and install this software, and then launch the software and select a proper scan mode.

select recovery mode

Step2. Find the disk from which data got lost and then the software would scan it for lost files. Patience is needed in order to find all lost files.

wait while scanning

Step3. You are allowed to preview files and then save the files you need.

preview found photo

download data recovery software

RAID Data Recovery Supported

RAID array is available in different levels, which has their own advantages and disadvantages. iCare Data Recovery Pro supports every level of RAID for file recovery:

RAID 0 Recovery

RAID 0 is the most basic RAID level, which can be created by 2 hard disks at least. RAID 0 stripes data, but it does not provide data redundancy and fault tolerance. The advantage of RAID 0 is that it offers high read / write performance and is able to increase the disk capacity. For example, if you create a RAID 0 array with 2 hard disks both have 80GB capacity, the capacity the RAID disk can be 160GB. The disadvantage of RAID 0 is, if one of hard disk in the array is corrupted, it will have influence on the system. Thus, the data stored on the disk runs risk of being corrupted or lost.

RAID 1 Recovery

RAID 1 provides disk mirroring, which is able to mirrored data from one disk to another. RAID 1 is created by 2 hard disks at least. When on disk is corrupted in the array, it does not affect the data on the other disks. RAID 1 provides fault-tolerance, but the capacity utilization is only 50%. In other words, if you add 4 hard disks which have 80GB capacity to create RAID 1, the available capacity is only 160GB.

RAID 2 Recovery

RAID 2 provides error-correcting coding, which stripes data from one disk to another. The speed of data read and writing in RAID 2 is slow.

RAID 3 Recovery

RAID 3 needs to be created by 3 hard disks at least. It provides a safe solution for data storage, but the speed is also slow.

RAID 4 Recovery

RAID 4 array stripes data at block level, which has a good performance of read / writing data.

RAID 5 Recovery

3 hard disks are needed at least to create a RAID 5 array, which provides data striping at byte level. Today, RAID 5 is one of the most frequently used array by different enterprises.

RAID 6 Recovery

RAID 6 is created by 4 hard disks at least, which provides good data redundancy. It stripes data at block level with parity data across all disks in the array.

RAID 10 Recovery

RAID 10 is combination of safety of RAID 1 and performance of RAID 0. It provides high read performance, but its capacity utilization is only 50%.

RAID Failures

RAID array seems to offers better solution for data storage, but it still causes data loss due to different RAID failures, including:

  • RAID controller failure
  • Hard disk failures in RAID array
  • Array configuration is missing
  • Missing RAID partition
  • RAID volume is unable to open or cannot be formatted
  • RAID arrays is uninitialized
  • Lights of RAID warns
  • RAID information lost, all disks in the arrays is off-line
  • Cannot enter RAID

Reasons:

When RAID array has any failures, here are some possible reasons:

  • Virus infection that lead RAID array failure
  • One or several hard disks is corrupted or physically damaged
  • Hard disk in RAID array contains bad sectors
  • RAID array is corrupted
  • RAID data gets lost due to array upgrading, system updating or system reinstalling
  • Sudden power outage or power off corrupts the RAID array
  • Windows check disk corrupts the RAID array
  • The disk order in the RAID is confused

Solutions:

When RAID array has any problem, you can do following things:

1. If RAID disk shows off-line, you can perform online operation (If system does not warn message saying rebuild the array, it usually does no harm to the data on the array. On the contrary, if system says needs to rebuild array, it probably causes data loss).

2. Replace the corrupted hard disk with new hard disk and rebuild the array.

3. Replace new RAID card

Please recover all data from RAID before rebuilding array or performing any other operations to repair the RAID failures.


RAID Data Recovery Resource


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