RAID Disk | Understanding the Redundant Array of Independent Disks

Dany updated on Mar 27, 2023 | Home > Knowledge Center

What is RAID Disk?

RAID Disk stands for Redundant Array of Independent Disks, and it is a data storage technology that uses multiple hard drives to improve performance, reliability, and redundancy.

It has become more critical to maintain the safety and accessibility of that data as organizations and individuals continue to collect and store growing amounts of data. Using RAID disks is one of the most well-liked ways to guarantee data availability and reliability. We shall examine the fundamentals of RAID disks in this post, including how they operate, their various levels, and the RAID data recovery.

Many physical hard drives are typically combined into a single logical unit using the RAID acronym, Redundant Array of Independent Disks to improve performance, data redundancy, and data recovery capabilities. RAID disks were first created in the 1980s, and since then, they have become a crucial component of modern computer systems.

In high-end servers, workstations, and data centers where a lot of data needs to be stored and accessed rapidly and reliably, RAID disks are frequently employed. Personal computers, particularly those used for video editing, gaming, and other data-intensive jobs, also use RAID disks.


How RAID Disk Works

RAID Disk creates a single storage unit out of several hard drives. The combined storage is quicker, more dependable, and more data loss resistant. Data is split across numerous hard drives using a method called disk striping in RAID Disk, which speeds up read and write operations. In order to increase fault tolerance and redundancy, RAID Disk can also use disk mirroring, which duplicates data across many hard drives.

There are various RAID levels, each with unique benefits and drawbacks. There are four main levels:

  • RAID 0: This level uses striping to distribute data among several drives, which can enhance performance by enabling simultaneous access to several disks. Unfortunately, since there is no redundancy, all data is lost if a disk fails.
  • RAID 1: It used mirroring to make an exact replica of the data on many disks. As a result, data can still be accessible from the other disks even if one disk dies. The size of a single disk, however, is the maximum storage capacity.
  • RAID 5: This level increases performance and redundancy by using striping with parity. All disks store parity data, allowing data to be recovered from the remaining disks in the event of disk failure. Performance, however, may be affected while the repair is being done.
  • RAID 6: This level is comparable to RAID 5, except it offers more redundancy by using two sets of parity data. Due to this, two disk failures are possible without data loss.

The next part will introduce the different types of RAID disks more specifically.

Different Types of RAID Disk

As we mentioned, the RAID disks can be divided into 4 levels/types, which are RAID 0, RAID 1, RAID 5, and RAID 6. They have various features and usages.

Type 1: RAID 0

The simplest and most fundamental RAID level is RAID 0, or striping. Blocks of data are divided into RAID 0 and equally spread over several physical hard disks. This data distribution enhances performance by simultaneously reading and writing data from several drives.

What is RAID 0

RAID 0 does not, however, offer redundancy or data recovery options. All information stored on a physical hard disk that fails in a RAID 0 array will be lost.

Type 2: RAID 1

RAID 1 offers total data redundancy and is also referred to as mirroring. Data is kept in RAID 1 on two or more physical hard drives, with an exact copy of the data saved on each disk. This redundancy offers an additional defense against data loss due to hardware failure.

RAID 0 vs RAID 1

RAID 1 is less cost-effective than other RAID levels that offer redundancy and performance benefits but provides no performance advantages.

Type 3: RAID 5

A RAID level called RAID 5 offers advantages for both performance and redundancy. Data is divided into blocks and spread across several physical hard drives in RAID 5, with parity information also being kept on each disk. If one of the physical hard drives fails, the array can recover the data thanks to this parity data.

What is RAID 5

RAID 5 is cost-effective and offers good performance gains because it only needs one additional hard disk for parity data. RAID 5 is more susceptible to repeated drive failures than other RAID levels, and it can be slow to restore data following a drive failure.

Type: RAID 6

RAID 6 is a variant of RAID 5 that uses two sets of parity data rather than one, adding a layer of redundancy. RAID 6 is the most dependable RAID level due to the additional redundancy that protects against drive failures on several drives.

RAID 6 can be slow when reconstructing data after a drive failure and necessitates at least four solid hard drives.

If the section is helpful for you to learn about the RAID types, share it on Facebook, Twitter, Instagram, and other social media platforms!


RAID Data Recovery

Users require RAID recovery for the same reasons that they require regular hard disk data recovery. Human error, hardware or software failure, malware infection, mechanical failure, power outage, faulty sectors, abrupt system shutdown, etc. can all lead to a failed or corrupted RAID. Yet when you need to recover a damaged RAID, things are different.

The RAID volume becomes unavailable and the data is lost when the RAID is damaged. But, you can't immediately access or restore data from RAID hard disks. Users find it most challenging to recover lost data because you have to reconstruct or rebuild the RAID arrangement.

Using a reputable RAID recovery program is very beneficial for recovering data from RAID drives! You may recover RAID data completely under Windows thanks to EaseUS Data Recovery Wizard. EaseUS RAID recovery software can assist you in recovering data from any RAID hard disk, as long as your computer system can identify it. This includes RAID 0, RAID 1, RAID 5, and RAID 10.


RAID disk is a kind of sophisticated storage device. Thus, RAID failure can be caused by various reasons such as hardware failure, software corruption, power surges, or physical damage. Identifying the cause of failure is essential to determine the appropriate recovery approach.

In that case, it's important to note that RAID data recovery requires specialized expertise. It's recommended to seek the help of a professional data recovery service if you're not experienced with RAID recovery.

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Updated by Dany

Dany is an editor of EaseUS who lives and works in Chengdu, China. She focuses on writing articles about data recovery on Mac devices and PCs. She is devoted to improving her writing skills and enriching her professional knowledge. Dany also enjoys reading detective novels in her spare time.

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