You are currently viewing the United Kingdom version of the site.
Would you like to switch to your local site?
1 MIN READ TIME

RAID levels explained

Ensure your data is protected by choosing the right RAID level for your needs

A redundant array of inexpensive disks (RAID) lets you use multiple hard disks together in a single pool to boost capacity, data security or both. RAID0 is the most basic and is known as striping. Data is spread evenly across all the disks you have installed, so the total capacity is the total of the hard disks you have installed.

Unlock this article and much more with
You can enjoy:
Enjoy this edition in full
Instant access to 600+ titles
Thousands of back issues
No contract or commitment
Try for 99p
SUBSCRIBE NOW
30 day trial, then just £9.99 / month. Cancel anytime. New subscribers only.


Learn more
Pocketmags Plus
Pocketmags Plus

This article is from...


View Issues
PC Pro
June 2025
VIEW IN STORE

Other Articles in this Issue


PC Pro
Your bonus software
We scour the globe to negotiate the best software deals for our readers, from extended licences to full programs you don’t need to pay a penny for. Here’s this month’s lineup
REGULARS
Editor’s letter
Never mind Windows 95, let’s time travel back to 1950
The A-List
The best products on the market, as picked by our editors
Readers’ comments
Your views and feedback from email and the web
Readers’ poll
See page 66 To tie in with
Next month
ON SALE Thursday 5 June 2025
Don’t start a trade war when you know nothing about trade, demands Jon Honeyball
W e are in the centre of a
BRIEFING
Trump tariffs are “like Covid again” for PC firms
Huge uncertainty over supply chains will disrupt PC prices and stocks this year
Microsoft heads off CrowdStrike 2
Quick Machine Recovery to avert Windows boot disasters
Britain’s full-fibre alternative
Zen Internet CEO Richard Tang wants to bring Britain’s disparate fibre networks together
FIBRE’S BIG BEASTS
Here are the UK’s major fibre providers that
VIEWPOINTS
We live in way too interesting times
Whether it’s world leaders, customer support teams or Chromebooks, the world is conspiring to make my life interesting in all the wrong ways
Forget AI and robots: lockers are the future
Nicole has found the secret to productivity, and it has nothing to do with advanced technology. It’s all about one simple innovation in sending parcels
The Phoney War with Virgin Media
It’s 2025 and apparently I must have a landline I don’t want, along with a tiny lump of plastic and wires
FEATURES
The inside story of Windows 95
30th ANNIVERSARY
BIG TECH BURNOUT
Many tech firms demand their staff work long hours. Barry Collins examines the toll it’s taking on employee wellbeing
WHICH HOME VOIP SERVICE IS BEST FOR YOU?
As Skype closes down and residential landlines switch to internet services, Nik Rawlinson picks the best VoIP providers for staying connected
PROCESSORS
CPUs the latest generation
The processor industry moves quickly, and a lot can change between laptop or PC purchases. Darien Graham-Smith breaks down all the latest chips from the big three CPU firms – and shares what we know about what’s coming next
REVIEWS
Scan 3XS Evolve Studio Pro
Equally at home in gaming and (most) 3D content creation tasks, this is an ideal jack of both trades
How we test
Laptops and PCs We put PCs and
Apple Mac Studio M4 Max and M3 Ultra
Macs are rarely bargains, but the Studio delivers striking levels of performance in M4 Max and M3 Ultra form
Wired2Fire R7X3D 9070 XT Beast
A strong debut for AMD’s Radeon RX 9070 XT, and if you have space to house it this is a striking choice
PCSpecialist Eclipse R70i Lumin
If you want a speedy gaming PC in a hurry, this is a well-built choice that will keep you happy for years
Razer Blade 16 (2025)
A gorgeous OLED display, impactful audio and Ryzen AI chip make this a great all-rounder, but others extract more from the GPU
MSI Prestige 13 AI+ Evo A2VM
An extremely powerful system for the price, and you can’t argue about its sub-1kg weight or battery life
Lenovo Idea Tab Pro
A great-value rival to the iPad due to its 12.7in screen and bundled stylus, even if the OS can’t match Apple’s
Xiaomi Pad 7 Pro
Pluses include a high-res screen, powerful processor and fast charging, but AI features remain iffy
Huawei MatePad Pro 13.2 (2025)
Yet another brilliant piece of hardware design from Huawei, but the lack of apps is too big a drawback
Eizo FlexScan FLT
A great choice for rollouts where power consumption is a priority – and the arm is an absolute triumph
Dell Pro 14 Plus (P1425)
A great-looking mobile monitor, but it’s about £100 too expensive given its resolution and features
Potensic Atom 2
A fantastic drone for budget-conscious pilots, capturing smooth 4K/30fps video and detailed 48MP stills
RayNeo Air 3s
Well-priced AR glasses that are ideal for long journeys thanks to a gorgeous picture and clear audio
Google Pixel 9a
Quite simply the best mid-range phone around, with useful AI features, long battery life and excellent cameras
Xiaomi 15
A solid Android phone with few flaws, but unlike the Xiaomi 15 Ultra it fails to stand out from the crowd
Samsung Galaxy A56 5G Enterprise Edition
A well-built big-screen phone enhanced with Galaxy AI, but don’t expect heaps of business-friendly extras
LABS
NAS DRIVES STORAGE AND BEYOND
With our guide to the best NAS devices currently available, you can take control of your files and run your own private cloud
Questions you need to ask before buying a NAS drive
There’s one easy way to avoid buyer’s remorse when purchasing a NAS drive, and that’s to have answers to these key questions before you reach for your card
Asustor Drivestor 2 Pro AS3302T
Although relatively cheap, this two-bay NAS has the performance and features to match high-end enclosures
Qnap TS-233
A simple, cheap, two-bay NAS, the TS-233 is good for basic needs but lags behind in terms of performance
Do I need special NAS hard disks?
We explain what hard disks you should buy to populate your NAS enclosure
Qnap TS-264
This two-bay model offers a strong combination of price, performance and flexibility via slots for future upgrades
Synology DiskStation DS723+
A fully featured and expandable NAS, which is only let down by the lack of 2.5GbE ports
Asustor Nimbustor 4 Gen2 AS5404T
Powerful and well priced, this is a great choice for everything from streaming to running a small office
Qnap TS-464
Powerful, fast and easy to expand, the Qnap TS-464 is a brilliant four-bay device that’s well suited to techies
Synology DiskStation DS923+
An expandable and flexible four-bay NAS that’s great for small businesses despite its gigabit Ethernet ports
TerraMaster F4-424 Pro
Extremely fast and powerful, this four-bay NAS is great for file storage, but its software lags behind
Synology DiskStation DS1522+
Five bays gives extra storage flexibility to complement the powerful SMB-friendly software and hardware
Qnap TS-h973AX
A nine-bay NAS with a mix of 3.5in and 2.5in hard disks and SSDs, but cheaper, more flexible options are available
How we test
As this Labs focuses on home and small
View from the Labs
Features and flexibility are important, but you need the network speed to keep up
THE NETWORK
VoIP buyer’s guide 2025
Buyer’s guide
3CX Phone System 20 Update 5
The IP PBX host with the most offers classy features and flexible deployment options at a tempting price
GoTo Connect Phone System
An easily deployed cloud-hosted solution with a feature set larger businesses will find very appealing
TelephoneSystems. Cloud
Clear pricing and a smart online quote system make this VoIP-to-go service ideal for SMBs
Voip Unlimited Voxone
Feature-rich and affordable, Voxone offers easily deployed and reliable cloud-hosted UC services
D-Link DAP-X3060OU
In need of a firmware upgrade but this Wi-Fi 6 AP is built for life outdoors and comes with free management software
Ruijie Reyee RG-RAP73Pro
Incredibly affordable and very fast, this Wi-Fi 7 AP is a cinch to deploy and includes free cloud management
Remote access: best practice
How do you efficiently and securely allow workers to access resources from wherever they happen to be? Steve Cassidy explores the different approaches and philosophies
ISO 27001
Can a single IT security standard apply to all businesses? Steve Cassidy explores an exacting certification scheme
REAL WORLD COMPUTING
“To say the software and firmware was buggy would be unfair to bugs. It was a horrible mess”
Truth? You can’t handle the truth. Or so developers appear to think, but Jon has a rather different point of view – whether you’re small, large or Apple
“It’s like bolting a Ferrari V12 to a shopping trolley, but it will go like the clappers down the milk aisle”
Lee explains why Microsoft’s PC Health Check may be fibbing to you, and why PC upgrades fuelled by Watneys Party Seven are a bad idea
“It’s a good idea to keep an eye on the legal pipeline and start planning how it could impact you”
If there’s one thing that stays the same in law, it’s that the law is always changing. And that’s even more true if your specialism involves technology
“I must be out of my mind even suggesting that 2FA could be past its sell-by date, right?”
Davey ponders the future of multi-factor authentication and has some sage words of advice on recovering your Google account if things go awry
“While the on-paper specification looked ideal, our real-world experience wasn’t so wonderful”
The Heathrow substation fire may not seem a natural topic for an IT column, but it highlights a problem that all IT teams need to address
RETRO
PageMaker: read all about it
Inspirational stories from computing’s long-distant past
FUTURES
The outlook is sunny for weather apps… thanks to AI
AI-based weather forecasting systems aren’t only cheaper than supercomputers, they could also bring more accurate predictions to the world. Nicole Kobie reports on the winds of change
Chat
X
Pocketmags Support