Handheld Storage: microSD Cards and What to Buy

Buy for the A2 rating, not the large number on the front of the packet. Games load many small files scattered across the card, which is random access — and the headline sequential figure describes something a game almost never does.

A note on this guide: this rests on how the card rating system is defined and how games access storage, not on benchmarking here. See how we test.

The problem, as it appears

A handheld fills up quickly, a card is the obvious answer, and the shelf offers a dozen at wildly different prices with several numbers on each. The largest, most prominent figure is a sequential read speed, and it is the least relevant one here.

The result is people buying either far more card than the device can use, or a cheap card whose random performance makes loading noticeably worse than internal storage.

Why the headline speed disappoints

Sequential speed describes reading one large continuous file — copying a video, mostly. Games do almost the opposite: thousands of small reads scattered across the card, in no particular order.

Random performance is described by the application-performance class instead, marked as A1 or A2. That marking is small, easy to miss, and it is the one that determines whether a game loads acceptably.

There is a second ceiling worth knowing. Handheld card readers have their own limits, frequently well below what a premium card can deliver, so paying for the fastest card available buys nothing in that device. It is not wasted if the card gets reused in a faster reader later — but it is not buying faster loading today.

What actually matters

The A2 rating. This is the one specification to check. It sets a floor for random read and write performance, which is what game loading depends on.

Capacity against what you actually install. Modern titles are large and card prices per unit of capacity fall as capacity rises, so the middle of the range is usually the sensible purchase.

That cards are labelled. Two cards are physically identical, and the failure this prevents is formatting the wrong one. That is not an inconvenience — it is a library gone.

Where the cards live when not in the device. A microSD card loose in a bag is a card that will be lost, and they are small enough to vanish permanently.

The options, and who each suits

An A2-rated card suits everyone here, in whatever capacity matches the library. This is the purchase; everything else on this page is organisation around it.

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Label stickers suit anyone with more than one card, which is most people within a year. They cost almost nothing and prevent the one genuinely expensive mistake in this category.

A storage case suits anyone travelling with spare cards or physical game media. Cards are small enough to disappear into a bag lining permanently, and a case with defined slots is the difference.

A card reader suits transferring at speed from a desktop rather than through the handheld. It also sidesteps the handheld's own reader ceiling, which is where a fast card finally shows what it can do.

The mistake to avoid

Buying the fastest card on the shelf and expecting shorter load times. Past the device reader's own ceiling the extra capability sits idle. Buy to A2 and put the difference into capacity, which is the constraint that actually bites.

The second mistake is treating a card as storage that is safe. Cards fail, and they fail more abruptly than drives do — frequently without warning and without partial recovery. Anything on a card that is not re-downloadable needs a copy elsewhere, which is the same argument as backing up more than game saves in a smaller package.