---
title: "All about RAID, Its Advantages, Disadvantages and Data Recovery - EXALAB"
description: "What is RAID 0, 1, 01, 10? Advantages, disadvantages, fault tolerance and why RAID is not a backup. A practical guide to configurations and RAID data recovery."
url: "https://www.exalab.cz/en/blog/explanations-and-tips/all-about-raid-its-advantages-disadvantages-and-data-recovery"
date: "2026-05-22T19:39:39+00:00"
language: "en-GB"
---
## All about RAID, Its Advantages, Disadvantages and Data Recovery
Some people mistakenly believe that RAID is a fail-safe solution and neglect regular backups. We can help if your array fails — RAID data recovery is our speciality.
 Given the variety of RAID configurations and the many problems that can occur, we cover RAID across several articles, starting with RAID 0, 1, 01 and 10. A comprehensive overview of all configurations including RAID 5, 6, 50, 60 and proprietary implementations (SHR, BeyondRAID, RAID-Z) is available on the [RAID Data Recovery](https://www.exalab.cz/index.php?Itemid=825) page.
- [What is RAID and a bit of history](#whatIsRAID)
- [RAID 0, 1, 01 and 10 — suitable use cases](#whereToUse)
- [Potential problems with RAID, or why you should back up even with RAID](#problemsBackup)
- [RAID data recovery](#RAIDdr)
## What is RAID?
RAID stands for Redundant Array of Independent Disks. It is a storage virtualisation technology that combines multiple logical units to improve performance and data redundancy. The term "redundancy" in computing means greater fault tolerance. In RAID, this is achieved in various ways depending on the chosen configuration. From the user's (or operating system's) perspective, the RAID array appears as a single drive (or multiple logical volumes). In short, we simply refer to it as an array.
DATA RECOVERY
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## A Bit of History
RAID technology was developed by a group of researchers at the University of California, Berkeley in 1987. They explored the possibility of a system recognising two or more hard drives as a single entity. The result was a storage system that performed much better than single-drive systems, but with very low reliability. The researchers then achieved higher reliability through a redundant architecture, increasing the fault tolerance of data storage. The IT industry immediately embraced the concept and designed five different levels or modes, each with its own advantages and disadvantages, comparing them with SLED technology.
## RAID versus SLED
The history of SLED (Single Large Expensive Disk) goes back roughly 25 years before RAID. SLED technology is based on using a single high-capacity, high-performance hard drive, which is expensive primarily due to the need to store large amounts of data while maintaining reliability and availability — without any redundancy.
RAID architecture thus positioned itself against SLED. Compared to SLED, RAID enabled higher reliability and speed using inexpensive hard drives. Originally, RAID stood for Redundant Array of Inexpensive Disks. This designation is no longer used today, and SLED has become a forgotten piece of history.
## RAID 0, RAID 1, RAID 01 and RAID 10
These RAID configurations provide partial fault tolerance through data mirroring, with the exception of RAID 0, which offers no fault tolerance at all. These configurations can sometimes seem a bit confusing, and RAID 5 or 6 may be more practical in many cases. However, unlike parity-based configurations, the absence of parity increases speed, which can be crucial in many applications.
#### RAID 0 — low reliability, but higher performance
- RAID 01 tvoří 2x RAID 0 a tyto se navzájem zrcadlí.
[RAID 01](https://www.exalab.cz/images/igallery/resized/101-200/RAID-01-192-800-600-80.jpg) ![RAID 01]( "RAID 01")
- Spolehlivost nízká, výkon vysoký. RAID 0 je kombinací dvou nebo více disků.
[RAID 0](https://www.exalab.cz/images/igallery/resized/101-200/RAID-0-193-800-600-80.jpg) ![RAID 0]( "RAID 0")
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RAID 0 — also known as a striped volume — is a combination of two or more hard drives. These drives are combined to achieve better performance and higher volume capacity. Striping means that data is split into blocks and distributed across the drives.
The weak point of RAID 0 is its reliability. If a single drive fails, data from the entire array is lost. It is therefore suitable for use where speed and higher capacity are the priority, but the data is expendable.
RAID 0 also exists in a linear configuration. When comparing the performance of linear and striped RAID 0, the striped configuration is the clear winner.
#### RAID 1 — higher reliability, lower speed
- RAID 10 se skládá ze 2 či více RAID 1 a tyto navzájem tvoří RAID 0.
[RAID 10](https://www.exalab.cz/images/igallery/resized/101-200/RAID-10-190-800-600-80.jpg) ![RAID 10]( "RAID 10")
- Spolehlivost vyšší, výkon nižší. RAID 1 - data jsou zrcadlena mezi 2 disky.
[RAID 1](https://www.exalab.cz/images/igallery/resized/101-200/RAID-1-191-800-600-80.jpg) ![RAID 1]( "RAID 1")
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RAID 1 — data is replicated from one drive to another. This architecture is known as "mirroring". The storage capacity equals the maximum capacity of the smallest drive in the array. It is recommended to use identical hard drives with RAID 1. It is possible to use different drives, but data will then be replicated between drives with different behaviour (different firmware, different access times, etc.), which can reduce array performance or cause other issues. RAID 1 offers greater reliability, but speed is comparable to that of a single hard drive. It is therefore suitable for less demanding applications.
#### RAID 01 (0+1) — mirrored RAID 0
- RAID 01 tvoří 2x RAID 0 a tyto se navzájem zrcadlí.
[RAID 01](https://www.exalab.cz/images/igallery/resized/101-200/RAID-01-192-800-600-80.jpg) ![RAID 01]( "RAID 01")
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Data is stored in a striped fashion across two identical RAID 0 arrays, which mirror each other.
#### **RAID 10 (1+0) — striped RAID 1**
- RAID 10 se skládá ze 2 či více RAID 1 a tyto navzájem tvoří RAID 0.
[RAID 10](https://www.exalab.cz/images/igallery/resized/101-200/RAID-10-190-800-600-80.jpg) ![RAID 10]( "RAID 10")
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Data is mirrored across two or more RAID 1 pairs, and these pairs together form a RAID 0.
The main difference between RAID 01 and 10 is fault tolerance. It depends on the specific configuration, of course. In the examples above, RAID 01 can tolerate the failure of 3 drives, but only if they are all from the same group. If, for example, drives 1 and 4 fail, the entire RAID 01 fails.
RAID 10 is more fault-tolerant. In the example shown, one drive can fail in each group (3 in total) and the RAID 10 remains functional.
If we compare performance and capacity, the values in both examples would be the same. Of the two variants, RAID 10 appears to be the better choice, and in practice we encounter RAID 10 more often in our data recovery work.
## Backups and RAID
Regardless of which RAID configuration you use, regular data backups are essential. Multi-drive array failures are more common than you might think. And human error should not be underestimated either. Backups are the best prevention — even for seemingly robust storage systems.
## What Can Go Wrong with RAID? Surely Fault Tolerance for One or More Drives Should Be Enough
RAID tends to make users overconfident. This excessive trust in a technology that is, in principle, usually very robust and reliable can lead to problems. The more drives you have, the higher the probability that one or more will fail. Drives used in RAID are often the same type and age, and therefore tend to have a similar lifespan. For this reason, it can make sense to use drives of the same model but from different production batches.
We also encounter cases where users purchase a quality NAS but then cut costs on the drives and use a model not designed for NAS use. Drives specifically designed for use in arrays (e.g. Western Digital RED, Seagate IronWolf or Toshiba N300) have higher vibration resistance, are rated for 24/7/365 operation and have a more robust construction overall. Standard desktop drives are not suitable for RAID. The situation is somewhat different if, for example, you want to create a RAID 1 (mirror) in your personal computer and use it as a regular drive.
Another common failure scenario occurs when users ignore warning signs from their storage device. NAS devices (the most common SOHO storage) have built-in functions that can detect a failing drive — often before it actually fails — and alert the user. An orange LED blinks, an audible alarm may sound, a warning email is sent, yet the data is still accessible. The user postpones the fix until the storage fails completely. At that point, there is often no choice but to turn to data recovery specialists.
The hardware of the storage device itself (controller, motherboard, etc.) can also fail. While this may not necessarily destroy the data, most users will not be able to access it without professional help. Simply moving the original drives to a different device can result in data loss. More about why replacing the controller or NAS may not help can be found on the [RAID Data Recovery](https://www.exalab.cz/index.php?Itemid=825) page.
Last but not least, human error can play a role — accidental deletion, overwriting or other file damage.
It is also important to keep in mind that RAID provides no protection against:
- Many software errors, NAS operating system failures, etc.
- Data destruction caused by software problems on the user's workstation, viruses or intentional damage
- Natural events such as fire, flood, lightning, external power surges, internal power surges, etc.
- Theft of the entire device
Absolute trust in any data storage is therefore misplaced. Regular backups can be done manually, but most of us are unable to maintain this at regular intervals. A solution can be replicating the entire storage to a separate, remote device. NAS manufacturers have this feature built directly into the management software of their devices. Even so, it is advisable to occasionally verify that backups are working as expected. More about recovering data from network storage can be found on the [NAS Data Recovery](https://www.exalab.cz/index.php?Itemid=826) page.
## RAID Data Recovery
RAID is widely used, from small home storage devices to enterprise storage in large organisations. We handle a significant number of RAID data recovery cases. Most commonly, these involve data recovery from NAS devices (QNAP, Synology, Western Digital, LaCie and others), but we also regularly work with more robust solutions that are typically not found in small businesses or homes.
Our long-term RAID data recovery success rate is approximately 95%. Diagnostics, consultation and courier pickup are free and non-binding. Detailed information about failure types, indicative pricing and our recovery process is available on the [RAID Data Recovery](https://www.exalab.cz/index.php?Itemid=825) page.
Whether you need help with RAID data recovery from your NAS, server, home computer or any other device, do not hesitate to contact us. [Consultation, courier pickup and diagnostics are free of charge.](https://www.exalab.cz/index.php?option=com_content&view=article&id=11&Itemid=200)
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## RAID 0, 1, 01 and 10
- RAID 10 se skládá ze 2 či více RAID 1 a tyto navzájem tvoří RAID 0.
[RAID 10](https://www.exalab.cz/images/igallery/resized/101-200/RAID-10-190-800-600-80.jpg) ![RAID 10]( "RAID 10")
- Spolehlivost vyšší, výkon nižší. RAID 1 - data jsou zrcadlena mezi 2 disky.
[RAID 1](https://www.exalab.cz/images/igallery/resized/101-200/RAID-1-191-800-600-80.jpg) ![RAID 1]( "RAID 1")
- RAID 01 tvoří 2x RAID 0 a tyto se navzájem zrcadlí.
[RAID 01](https://www.exalab.cz/images/igallery/resized/101-200/RAID-01-192-800-600-80.jpg) ![RAID 01]( "RAID 01")
- Spolehlivost nízká, výkon vysoký. RAID 0 je kombinací dvou nebo více disků.
[RAID 0](https://www.exalab.cz/images/igallery/resized/101-200/RAID-0-193-800-600-80.jpg) ![RAID 0]( "RAID 0")
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*Jean-Marie Dufrasne contributed to this article. Thank you.*
```
Details By Frantisek Fridrich Frantisek Fridrich Parent Category: [Blog](https://www.exalab.cz/en/blog) [Explanations and Tips](https://www.exalab.cz/en/blog/explanations-and-tips)
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