Everything You Need to Know About Memory: A Guide to Flash Storage and SanDisk Products at Maplin

We live in an age of more data than ever before. Smartphones capture 50-megapixel photos and 4K video. Laptops fill up with years of documents, downloads, and media. Cameras churn through hundreds of shots in an afternoon. And yet, for all the storage built into our devices, we almost always end up needing more.

That's where removable flash memory comes in — and nobody makes it better than SanDisk. In this guide, we'll explain what flash memory actually is, break down the different types available, and walk you through the full SanDisk range stocked by Maplin so you can find exactly the right product for your needs.

Flash memory is a type of non-volatile storage — which means it holds onto your data even when the power is switched off. Unlike the RAM inside your computer (which loses everything the moment you shut down), flash memory retains files indefinitely without needing a constant power supply. That's what makes it ideal for portable storage devices.

The technology works by storing data in cells made from floating-gate transistors. When you write a file, electrical charges are trapped inside these cells to represent data as ones and zeros. Erase the file, and the charge is removed. This cycle can be repeated thousands of times, which is why flash storage has a finite — though typically very long — lifespan measured in write-and-erase cycles.

Flash memory replaced the floppy disk, largely displaced the CD and DVD for portable storage, and has now become the backbone of nearly every modern storage device: USB flash drives, SD cards, microSD cards, and solid-state drives (SSDs) all rely on it.

Not all flash storage is the same. The format you need depends entirely on what device you're using it with and what you're trying to do.

USB flash drives (also called thumb drives or pen drives) are the most universally recognised form of removable storage. They connect directly to a USB port — increasingly available in both USB-A (the traditional rectangular connector) and USB-C (the newer, smaller, reversible connector) — and work as plug-and-play storage on virtually any computer, laptop, smart TV, or car stereo. They're primarily used for carrying files from one place to another rather than recording content directly. Think of them as a digital briefcase: quick to pick up, quick to put down.

Full-size SD cards are the standard for digital cameras, camcorders, and many laptops. They come in three capacity formats: standard SD (up to 2GB), SDHC (2GB–32GB), and SDXC (32GB–2TB). Speed ratings — Class 10, UHS-I, UHS-II, and Video Speed Class (V30, V60, V90) — determine how quickly data can be written, which matters enormously for video recording and burst-mode photography. The faster the card, the more smoothly it handles large amounts of data being written in real time.

MicroSD cards are essentially SD cards shrunk down to thumbnail size. Originally developed for mobile phones, they're now used in smartphones, tablets, action cameras, dash cams, drones, and handheld gaming consoles. Most microSD cards come bundled with a full-size SD adapter, which lets them slot into standard SD card readers. Despite their tiny size, microSD cards can carry the same capacities and speeds as their full-size counterparts.

When it comes to flash storage, SanDisk is one of the most trusted names in the business — and with good reason. Founded in 1988 (originally as SunDisk) by Eli Harari, Sanjay Mehrotra, and Jack Yuan in Milpitas, California, SanDisk was a pioneer in the development of solid-state storage technology. Over more than three decades, it grew from a specialist semiconductor business into the world's largest dedicated flash storage company.

In 2016, SanDisk was acquired by Western Digital, further strengthening its R&D capabilities and global reach. Today, SanDisk's products — from everyday microSD cards to professional-grade SDXC cards — are found in devices all over the world, trusted by casual users, content creators, and working professionals alike. The brand sits across two clear product tiers: the Ultra range, designed for everyday reliability and good-value performance, and the Extreme/Extreme Pro range, engineered for maximum speed and demanding professional use.

Maplin stocks a carefully selected range of SanDisk products across all three main flash storage formats, allowing you to pick exactly the right product for your device and budget.

USB flash drives are versatile and inexpensive, and generally durable — and SanDisk makes some of the very best.

The entry point to the SanDisk USB range, the 64GB Ultra USB 3.0 offers read speeds of up to 130MB/s and is backward-compatible with USB 2.0 ports, meaning it'll work with virtually any machine — Windows, Mac, Android, or iOS. It's the ideal everyday drive for students, home users, and anyone who regularly needs to move documents, photos, or music without fuss.

For those who need serious capacity with serious speed, the 256GB Ultra USB 3.2 delivers read speeds of up to 130MB/s and storage enough to carry entire project folders, video files, or photo libraries. The compact sliding design keeps the connector protected when not in use, and the included SanDisk SecureAccess software allows you to create a password-protected, encrypted folder for your most sensitive files.

The most versatile drive in the range, the Dual Drive Luxe features both a USB-A and a USB-C connector in a sleek swivel body, making it effortless to move files between older laptops and modern devices without the need for an adapter. With read speeds of up to 400MB/s — among the fastest in the consumer USB drive market — and support for the SanDisk Memory Zone app (which automatically backs up photos and videos from your Android device), this is the drive for anyone juggling multiple devices.

The majority of content created for microSD and SD memory cards comes from cameras or mobile devices, which benefit from the cards' small form factor. SanDisk's Ultra microSD range covers the full spectrum of everyday use.

The 64GB Ultra MicroSDXC is designed for Android smartphones and tablets. This card delivers read speeds of up to 100MB/s and A1-rated app performance — meaning apps installed on the card load quickly rather than sluggishly. Class 10 rated for Full HD video recording and playback, it comes with a 7-year limited warranty and is a solid first step for anyone whose phone is perpetually running out of space.

Double the capacity, same dependable performance. The 128GB version includes a full-size SD adapter, so the card can also be used in cameras, laptops, and card readers that accept standard SD cards. The SanDisk Memory Zone app helps you manage your content and free up space on your device automatically.

Built for multi-device households, this microSDXC card is compatible with Android smartphones, tablets, Windows laptops, and Chromebooks. With read speeds of up to 150MB/s (using the SanDisk MobileMate card reader), A1-rated app performance, and 128GB of capacity for downloaded shows, music, games, and photos, it's the right pick for anyone whose digital life spans multiple screens and platforms.

SD and microSD memory cards are often used to record and store photos, music, videos, apps, and files. For camera users, choosing the right full-size SD card can make a real difference to how smoothly your shooting session goes.

The ideal companion for compact and point-and-shoot cameras, this full-size SDXC card holds hours of Full HD video and plenty of high-resolution stills, with read speeds of up to 100MB/s to make transferring your shots quick and easy. Weighing just 2.1g, it adds nothing to your camera bag. A 7-year limited warranty offers lasting peace of mind.

For those who shoot frequently and don't want to change cards mid-session, the 128GB Ultra SDXC doubles the capacity while maintaining the same reliable 100MB/s read speed. It transfers up to 875 photos per minute, handles Full HD video without a stutter, and like all SanDisk Ultra SD cards, is durability tested to be waterproof, shockproof, X-ray proof, and temperature-proof — so your memories stay safe even when life gets unpredictable.

This is the flagship card in Maplin's SanDisk range, and it's built for those who demand professional-grade performance. With read speeds of up to 200MB/s powered by SanDisk QuickFlow Technology, and write speeds capable of handling RAW+JPEG burst shooting, sequential captures, and stutter-free 4K and 8K video recording, the Extreme Pro leaves nothing on the table. The 256GB capacity is sufficient for even the most marathon shooting sessions, UHS Speed Class 3 (U3) and Video Speed Class 30 (V30) ratings guarantee smooth video capture, and the card is built tough — waterproof, shockproof, temperature-proof, and X-ray proof.

Still not sure which format is right for you? Here's a quick guide:

Once you've identified the format you need, here's how the SanDisk range at Maplin maps to different users:

Maplin offers free delivery on small items over £35 and express 1–3 day delivery for £6.99.

All SanDisk products at Maplin are covered by the manufacturer's warranty — typically 5 to 7 years depending on the product — so you're well protected long after purchase.

Browse the full SanDisk range at Maplin and find the storage solution that fits your life.