USB Flash Drives: How to Choose the Right One (Speed, Storage & Type)

USB flash drives have come a long way since the early days of 32MB "memory sticks" that cost a small fortune. Today you can carry a terabyte of storage on your keyring — but with a bewildering range of speeds, connectors, and capacities on the market, choosing the right drive is trickier than it looks.

This guide covers everything you need to know: USB standards explained in plain English, read and write speeds, storage capacities, USB-A vs USB-C, encryption options, and which drive suits which use case.

Browse our full range of USB flash drives at Maplin →

A USB flash drive — also called a thumb drive, pen drive, or memory stick — is a compact, portable storage device that uses flash memory chips to store data. Unlike a traditional hard drive, it has no moving parts, which makes it small, silent, durable, and remarkably resistant to knocks and drops.

Flash drives connect via a USB port and work with virtually any device that has one: laptops, desktop computers, smart TVs, games consoles, car stereos, and more. They're one of the most practical ways to transfer, back up, or share files.

The USB version is the single most important spec on any flash drive, because it determines how fast your files actually move. Here's what each standard means in practice.

• Theoretical maximum: 480 Mbps
• Real-world speed: 10–30 MB/s
• Best for: Documents, PDFs, presentations, photos

USB 2.0 is the older standard still found on budget drives. It's perfectly adequate for carrying text files and spreadsheets, but copying a 10GB video file can take 5–15 minutes. If you mainly shuttle Office documents or photos between devices, USB 2.0 is all you need — and the value is hard to beat.

The SanDisk Cruzer Blade range sits in this category. The compact, capless design is genuinely practical for everyday carry, and if you need to kit out multiple people — family members, students, colleagues — the SanDisk 16GB Cruzer Blade 3 Pack is an excellent value option. For a bit more room, the 64GB Cruzer Blade gives you a generous capacity at a budget-friendly price.

• Theoretical maximum: 5 Gbps
• Real-world speed: 80–150 MB/s
• Best for: Large files, photo libraries, video backups, OS installations

USB 3.0 is the sweet spot for most users — roughly 5–10 times faster than USB 2.0 in real-world use. You'll also see it labelled as USB 3.1 Gen 1 or USB 3.2 Gen 1 — these are the same 5 Gbps standard, just rebranded over the years. USB 3.0 ports are typically colour-coded blue.

The SanDisk 64GB Ultra USB 3.0 Flash Drive is a great example of what this standard delivers in practice — up to 80MB/s read speed and a retractable connector, making it a solid all-rounder for home and office use.

• Theoretical maximum: 10 Gbps+
• Real-world speed: 300–1,000 MB/s
• Best for: 4K video, large system backups, professional workflows

For users who regularly move large files, the faster USB 3.2 drives make a real difference. The SanDisk 128GB Ultra USB 3.2 Flash Drive and 256GB Ultra USB 3.2 both hit up to 100MB/s read speeds — a big step up from USB 2.0, and more than enough for most home and creative users.

Most flash drives advertise two speed figures:

• Read speed: How fast data transfers from the drive to your computer
• Write speed: How fast data transfers to the drive from your computer

Read speeds are almost always faster, and manufacturers typically lead with the read figure. If you're regularly copying files onto the drive — backing up data or loading a drive from your PC — the write speed is what matters most in day-to-day use.

Example: A drive marketed as "up to 100 MB/s" might only achieve 30–40 MB/s write speeds. For a 50GB backup, that's the difference between 20 minutes and well over an hour.

Always check both figures before buying if transfer speed matters to you.

USB flash drives range from 16GB right up to 1TB. Here's a practical guide:

Capacity What It Holds Best For

For most people: A 64GB or 128GB USB 3.0 drive strikes the best balance of capacity, speed, and value. The SanDisk 128GB Ultra USB 3.2 is a particularly good choice — fast, compact, and with enough room to grow.

Students equipping themselves for a new term might also want to take a look at the Maplin Study Tech Kit, which bundles useful tech accessories together at a strong price point.

Shop all USB flash drives at Maplin →

The connector type determines which devices your drive works with — and whether you'll need an adapter.

The classic rectangular connector. Still the most common port on desktop computers, Windows laptops, smart TVs, and games consoles (PS4, PS5, Xbox).

Best for: Desktop PCs, older laptops, TVs, games consoles, car stereos

The SanDisk Cruzer Blade and SanDisk Ultra USB 3.0 ranges both use USB-A and will work with the vast majority of devices in your home.

The smaller, oval connector found on modern MacBooks, many mid-to-high-end Windows laptops, Android smartphones, and tablets. USB-C flash drives plug in directly without needing an adapter.

Best for: MacBook users, modern Windows laptops (Dell XPS, HP Spectre, Surface Pro), Android phones and tablets

Some drives feature both connectors, giving you maximum compatibility from a single device. The SanDisk 64GB Ultra Dual Drive Luxe is a standout option here — a premium steel design with both USB-A and USB-C connectors and USB 3.2 speeds. If you regularly move between a desktop PC and a modern laptop, this is the drive to get.

If you're carrying sensitive data — client files, financial records, personal information, or anything work-related — a standard flash drive is a genuine security risk if it's lost or stolen. Anyone who picks it up can read everything on it.

An encrypted flash drive protects your data even if the physical device falls into the wrong hands.

Tools like BitLocker (Windows) and FileVault (Mac) can encrypt the contents of any flash drive at no extra cost. The limitation is that you typically need a compatible operating system to decrypt it, which can reduce flexibility when accessing files on other machines.

Hardware-encrypted drives have a built-in security processor. Many use a physical keypad for PIN entry and don't rely on the host computer — making them compatible with any device and significantly harder to attack.

Key features to look for:

• AES 256-bit encryption — the gold standard for data protection
• Brute-force protection — the drive locks or wipes itself after a set number of wrong PIN attempts
• FIPS 140-2 certification — required in many regulated industries (government, healthcare, finance)
• Cross-platform compatibility — works on Windows, Mac, and Linux without additional software

Not all flash drives are the same shape. The physical design matters depending on how you plan to use it:

• Standard drives — The everyday design, compact and practical
• Retractable/sliding drives — No cap to lose; the connector slides in when not in use (like the SanDisk Ultra range)
• Capless drives — Similar convenience to retractable, often with a fixed loop for a keyring (like the Cruzer Blade)
• Nano/ultra-compact drives — Barely protrude from the port; ideal for leaving semi-permanently in a TV or laptop
• Rugged/waterproof drives — Built to survive drops, dust, and water ingress; useful for outdoor or site work
• OTG (On-The-Go) drives — Designed for smartphones and tablets, combining USB-A with USB-C or Micro-USB

1. Always eject safely — Use "Safely Remove Hardware" on Windows or drag to Trash on Mac before unplugging. Removing a drive mid-write can corrupt your files.
2. Don't use it as your only backup — Flash drives aren't designed for long-term archival storage. Always keep a second copy of important files in another location (cloud storage or an external hard drive).
3. Scan before opening on shared machines — If a drive has been used on an unknown computer, run an antivirus scan before opening any files.
4. Avoid leaving drives in ports in hot environments — Prolonged heat can degrade flash memory over time.
5. Label multiple drives — If you use several drives, a bit of masking tape or a label maker saves a lot of confusion.

Your Situation Recommended Drive

Whether you need a reliable everyday drive for documents, a high-speed USB-C stick for your MacBook, or a large-capacity drive for video and backups, Maplin stocks a wide range of SanDisk flash drives to suit every use case and budget.

Browse all USB flash drives at Maplin →