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RAID Disk Recovery

The article shares common types of RAID disks and the some approaches to recover the lost files from them.

Updated on 2020-12-31

Using a RAID to store data remains one of the most common and cost-efficient methods to increase server’s storage performance, availability, and capacity.

You can check everything about RAID and How to Recover Corrupted RAID in this video.

RAID stands for Redundant Array of Independent Disks, a technology that prevents data loss by increasing the performance and/or the reliability of data storage. It is a group of multiple physical drives that uses a certain common method to distribute data across the drives. Some of the most commonly used are RAID level 0, RAID level 1, RAID level 5 and RAID level 10.

Common RAID Types

RAID level 0 – Optimized for Performance

RAID 0 uses striping to write data randomly to multiple disks. This means that when you write a 5GB file across 5 drives, 1GB of data is written to each drive.
By using multiple disks (at least 2) at the same time, this offers superior read and write performance. However, it is not fault-tolerant. If one drive fails, all data in the RAID 0 array are lost

RAID level 1 – Optimized for Redundancy

RAID 1 uses mirroring to write data to multiple drives. This means that when you write a file, the file is actually written to multiple disks. If one of the disks fails, all data is still safe on others. The tradeoff with RAID 1 is the cost. With RAID 1, you must purchase double the amount of storage space that your data requires.

RAID level 5 –  A Good Compromise

RAID 5 is the most popular secure RAID level. This type features the stripping of RAID 0, as well as error correction, resulting in a combination of excellent performance and fault tolerance.
In the event of a disk failure, you simply replace the failed disk and keep going.

RAID level 10 -- Optimize for Performance and Redundancy

It is possible to combine the advantages (and disadvantages) of RAID 0 and RAID 1 in one single system. RAID level 10 provides security by mirroring all data on secondary drives while using striping across each set of drives to speed up data transfers.

How to recover from RAID

RAID technology improves on traditional hard drive storage significantly, especially in terms of dependability. However, RAID Drive is not an adequate Backup. You may still suffer from data loss from it. There are 2 scenarios of data loss on RAID disks. And the solutions of each scenario are different.

1. RAID is still accessible.
The recovery process is easy if the data loss is caused by deletion, formatting or re -partitioning. The RAID is still recognized as a single disk by the operating system. Just use EaseUS Data Recovery Wizard to scan the RAID disk and recover the lost file. It is the same as recovering from a normal HDD. You can watch the video introduction here.

2. RAID is totally failed and unrecognizable.
RAID failure may happen due to various reasons, such as human errors, sudden power failure, abrupt system shutdown or other software/hardware related errors. In this case, RAID disk is broken and can not be recognized as a single disk.
For RAID 1(Mirroring), all the disks have the same data, so you can just pick one of the disks to recover the files.
But the case is not the same when it comes to the other RAID disks which use striping. Take RAID 0 as an example, each drive has part of the files, and scanning single disk will only find partial and corrupted data. So the precondition of the recovery, is to rebuild the disks to the same RAID status as before.
You can contact a local data recovery center to rebuild the RAID to the previous status, which is always of great expense. However, you do have another more affordable option now.
Recently we launch our EaseUS Manual Recovery Service to remotely rebuild the corrupted RAID, copy the lost files to another disk so that you can access to them again.  
If you are interested in this cost-efficient 1-on-1 manual recovery service, you can contact EaseUS engineer via LiveChat or support@easeus.com, clearly describe your questions, and make an appointment for a remote connection to start the FREE diagnosis. One dedicated engineer would be assigned to your case and he will take a good care of everything.


Do you need specialized Manual Data Recovery Services?

You may need further help for tough data loss situations like reformatting drive, RAW disk, partition loss, repartition failures, system boot error and virtual disk corruption. Consult with EaseUS Data Recovery Experts for cost-efficient one-on-one manual recovery service. They could offer the following services after FREE diagnosis:

1. Repair corrupted RAID structure
2. Unformat the drive which was formatted by mistake
3. Repair damaged RAW drive that needs to be reformatted (Bitlocker encrypted drive is also supported)
4. Repair unbootable Windows operating system
5. Recover/repair lost partition and reparitioned drive (the one that cannot be recovered by software)

6. Repair corrupted virtual disk file (.vmdk, .vhd, .vhdx, etc.)

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