Collection: SanDisk Flash Memory Cards

Which SanDisk flash memory card do you actually need?

Most PC builders only think about memory cards when a camera, handheld or dashcam arrives and the card is the bottleneck. With SanDisk flash memory cards, the tiers differ in controller behaviour, NAND quality and sustained write speed, not just the number on the label. Entry lines like the Ultra family are built for read-heavy jobs such as phones, tablets, Switch-style consoles and general storage. They hit decent read speeds, but sustained writes are modest and not guaranteed. That's fine for dumping photos, but it will choke on 4K video.

The sweet spot is the Extreme line. These cards pair faster NAND with a controller that holds a U3/V30 minimum write speed, which is the figure that matters for 4K recording, drone footage and burst photography. Read speed gets the marketing, but the guaranteed minimum write rate is what stops dropped frames. The enthusiast tier is Extreme PRO, particularly the UHS-II SD cards (V60 and V90) and CFexpress. These use a second row of pins and a wider bus, so they can sustain far higher writes for high-bitrate RAW video and long bursts. Diminishing returns hit hard here. If your camera or reader only supports UHS-I, a UHS-II card just falls back to UHS-I speeds and you've paid extra for nothing.

Then there are the endurance lines (High Endurance and Max Endurance). These trade peak speed for NAND and firmware tuned to handle constant overwriting, which is what dashcams, security cameras and always-recording setups do. A standard card in a dashcam can wear out in months. An endurance card is built for that duty cycle.

Upgrading and technical nuances

The first trap is the interface. UHS-I tops out around 104MB/s in theory. UHS-II roughly triples that with the extra pin row, and SD Express (PCIe/NVMe-based) goes further again, though the host device has to support it. microSD Express is a separate story: it's what some newer handhelds want, and a regular microSD won't get you the same performance, or sometimes won't work at all, in devices that require it.

The A1 and A2 ratings matter if you're running apps from the card, such as on an Android device, a handheld or a Raspberry Pi. They describe random I/O (IOPS), not sequential speed. A2 cards cope better with small random reads and writes, but only if the host supports the command queuing needed to use it. For a Pi boot drive, look at the Extreme or a high-endurance card, but for anything serious a proper SATA or NVMe drive from our Solid State Drives (SSD) range is a much better bet.

Reader quality is the other half. A UHS-II card in a cheap USB 2.0 reader will crawl. You want a UHS-II reader on USB 3.x or USB-C, and a decent cable from Cables & Connectors so the link doesn't drop speeds. Most current Motherboards on AM5 and LGA1851 don't include a card reader at all, so plan on an external reader or a case with a front-panel slot. Check the Computer Cases specs if that matters to you.

For capacity, SDHC covers up to 32GB and SDXC from 64GB up to 2TB. Older cameras and devices may not read SDXC or may need exFAT support. Most cards ship formatted in exFAT, and reformatting in the device itself is usually best.

Practical things to check before clicking buy

Start with the form factor. SD, microSD, CompactFlash and CFexpress aren't interchangeable, and CFexpress comes in Type A and Type B, which are physically different. A microSD with an adapter works in an SD slot, but adapters can be flaky at UHS-II speeds, and most microSD cards are UHS-I anyway.

Check your device's maximum supported speed and capacity. Many cameras and drones list a recommended card class, so match V30 or V60 to the bitrate you're recording, not the biggest headline figure. If you shoot 4K at high bitrates, calculate roughly how many GB per hour you'll generate and size up accordingly. Big cards are convenient but putting everything on one card is a single point of failure, so a couple of mid-size cards is safer.

Heat is a real factor in tiny enclosed devices. Dashcams baking in a parked car and drones in direct sun are hard on flash memory, so look at the card's rated operating temperature range. Endurance cards are generally better rated for it.

For home setups, many IP cameras take a microSD for local recording. If you're building a camera network with TP-Link gear alongside your Networking kit, an endurance card is the sensible choice, since it's constantly overwriting footage. If you're filling a card with RAW footage and colour grading it, a calibrated panel from Monitors will matter more than a faster card.

Counterfeits are the biggest gotcha. Fake cards with inflated capacity show up on marketplaces and some online stores. They'll accept data, then corrupt it once you pass the real capacity. Buy from authorised resellers, check packaging and run a capacity test such as H2testw or F3 on a new card before you trust it. If you're building a complete rig or looking at pre-built Computers, it's worth checking if a card reader is included.

Brands and local warranty

SanDisk is the benchmark name in this category and is the one most people reach for, with the Ultra, Extreme, Extreme PRO and endurance families covering most needs. Other reputable names include Samsung (the EVO and PRO lines), Kingston (Canvas series), Lexar and ProGrade Digital, with the last two popular among professional photographers and videographers. Cards from these brands are all built to proper standards, so the choice usually comes down to price, the speed class you need and what's in stock.

Local warranty matters more than most people think. Memory cards are often sold with long or even lifetime warranties, but that only helps if the retailer is an authorised Australian seller and the claim goes through local channels. Under Australian Consumer Law, you also have rights if a card fails well before it should, regardless of the manufacturer's terms. Grey imports and marketplace sellers can make this messy, and a counterfeit card isn't covered by anything. Keep your invoice and don't throw the packaging out until you've verified the card.

Frequently asked questions

Do I need a UHS-II card?

Only if your camera or reader supports UHS-II and you're recording high-bitrate video or shooting long RAW bursts. In a UHS-I device, it will just run at UHS-I speeds, so a good Extreme card is the better value.

What does V30 actually mean?

V30 means the card guarantees a minimum sustained write speed of 30MB/s. That's the number to match against your camera's bitrate, because it stops the recording stalling when the card's buffer fills up.

Can I use any microSD card in a handheld or Pi?

Usually yes, but quality varies a lot. For random I/O workloads, look for an A2-rated card from a series like the Extreme. If the device specifically requires microSD Express, a standard microSD won't be enough.

How do I know a card is genuine?

Buy from an authorised reseller, check the printing and packaging, then run a capacity and speed test when you get it. If the card claims a size it can't actually hold, return it straight away.

Is a bigger card always better?

Not necessarily. Bigger cards cost more per GB at the top end, and one failure can wipe out everything on the card. Two mid-size cards are often smarter than one massive one, particularly for events or travel.