Micro SD Card Guide: Switch, Phones, Cameras

If you’ve ever stared at a wall of microSD cards in a shop and wondered which one actually works with your Switch—or your Samsung phone, or that security camera—you’re not alone. The specs printed on these cards are a minefield of abbreviations, and not every card that fits will actually do the job.

Common Capacities: 16GB to 256GB · Popular Brands: SanDisk, Samsung, Lexar, Integral · Key Uses: Smartphones, Security Cameras, Nintendo Switch · Form Factor: 11mm x 15mm · Top Retailers in Ireland: Currys, Tesco, Harvey Norman

Does it matter what microSD card I get?

The short answer is yes—and the differences are more than skin deep. A card that looks identical to its neighbour on the shelf can perform worlds apart once it’s inside your device. Getting the wrong combination of speed class and capacity means laggy gameplay, skipped frames in camera footage, or in the worst cases, a card your device simply won’t recognise.

Speed classes explained

Speed ratings exist because not every task needs the same throughput. Your phone reading a few photos can make do with a slower card, but your security camera recording 1080p footage continuously, or your Nintendo Switch loading game data, needs something beefier. The most relevant ratings for Irish buyers are:

• U1 (UHS-I, Class 1): Minimum 10 MB/s write speed — basic storage use
• U3 (UHS-I, Class 3): Minimum 30 MB/s write speed — 1080p recording and gaming
• V30: Minimum 30 MB/s video write — 4K camera recording
• A1/A2: App Performance Class — relevant for phones running apps off the card (Samsung phones, for instance, support this)

The implication: choosing a card below U3 for Switch gaming effectively sacrifices smooth performance for marginal savings.

Capacity needs for different devices

Capacity isn’t just about how many photos you can store. Different devices have hard ceilings on what they’ll accept, and going over those limits means the card simply won’t work. The Nintendo Switch family (original, OLED, and Lite) all share the same microSD compatibility, supporting microSD (up to 2GB), microSDHC (4-32GB), and microSDXC (64GB and above) formats up to a maximum of 2 TB. Nintendo Australia Support confirms this, and the same applies to EU units.

Security cameras like the TP-Link Tapo range typically support up to 256GB or 512GB depending on the model. Samsung Galaxy phones (including the S20 FE) support expansion up to 1TB on some models. Knowing your device’s ceiling before you buy saves a return trip to the shop.

How to pick a good microSD card?

Choosing the right microSD card comes down to two things: what device you’re putting it in, and what you’re planning to do with it. Compatibility varies more than most people expect, and a card that works perfectly in one device can be completely wrong for another.

Check compatibility first

Before anything else, find your device’s specifications. The Nintendo Switch uses UHS-I cards exclusively—UHS-II cards physically won’t fit properly and won’t gain you any speed advantage anyway. Security cameras often have specific endurance requirements, prioritising write longevity over raw speed. Samsung Android phones typically support the A2 app performance class, meaning apps can run directly from the card without lag.

The microSD card slot on Nintendo Switch is located behind the kickstand on the back of the console. Team Group’s practical guide notes that you should always power off the console before inserting or removing a card to avoid data corruption—a step many users skip.

Prioritise speed and endurance ratings

For security cameras and dash cams, endurance is the critical factor. Look for cards marketed as “high endurance” or “monitor-grade”—these are designed to handle constant overwrite cycles that would destroy a standard card within months. For gaming, speed is king: Nintendo’s official guidance recommends 60-95 MB/s for the best experience on Switch. Nintendo UK Support confirms this transfer speed window is optimal.

• Gaming (Switch): U3, UHS-I, 60-95 MB/s minimum
• Security cameras: High endurance, V30 or better, at least 64GB
• Android phones: A2 class for app performance, U3 for media storage
• Photography: V60 or V90 for 4K/8K video, U3 minimum for stills

What’s the difference between SD and microSD?

The names sound interchangeable, but SD and microSD are distinct formats—and mixing them up means a wasted trip to the shop. Understanding the physical and technical differences helps you avoid buying the wrong card, especially when shopping online or in unfamiliar retailers.

Size and adapter use

MicroSD cards measure 11mm × 15mm × 1mm—the tiny square you slip into phones and the Switch. Full-size SD cards are roughly 32mm × 24mm × 2.1mm. Only microSD cards physically fit the Nintendo Switch slot. Nintendo UK’s official compatibility list makes this unambiguous: SD and miniSD cards are not compatible due to slot size.

Most microSD cards come with a full-size SD adapter in the packaging, which is useful if you want to read the card in a laptop’s SD slot. The adapter doesn’t change the card’s speed or capacity—it simply bridges the physical size gap.

Capacity and speed limits

Both formats share the same underlying storage technology (SLC, MLC, TLC, or 3D NAND depending on price point), but the standards have evolved differently:

• microSD: Original standard, up to 2GB
• microSDHC: Extended capacity, 4GB to 32GB
• microSDXC: eXtended Capacity, 64GB to 2TB (exFAT required)
• microSDUC: Ultra Capacity, 2TB to 128TB (future standard)

Speed limits are determined by the card’s controller and NAND type, not the format itself. A high-quality microSDHC card can outperform a low-quality microSDXC card. All major brands of microSD (SD, SDHC, SDXC) work if the specifications match your device, according to community testing on GameFAQs.

What type of SD card for Tapo camera?

TP-Link’s Tapo and Kasa camera ranges have become popular choices for Irish homeowners setting up security systems on a budget. Getting the right microSD card matters here more than in most devices—these cameras write constantly, and the wrong card fails quickly.

TP-Link compatibility list

TP-Link publishes compatibility guidance for their camera range, and the key takeaways are consistent: high endurance cards are strongly recommended over standard consumer cards. The continuous overwrite pattern that 24/7 recording creates will destroy a standard card within 3-6 months, whereas high-endurance cards are rated for 12 months or more of continuous use.

The Tapo and Kasa ranges support microSDHC and microSDXC cards up to 256GB or 512GB depending on the specific model. Check your camera’s specifications in the manual or TP-Link’s app before purchasing.

Recommended capacities

For 1080p recording at medium quality settings, 128GB typically holds approximately 7-10 days of footage before looping. Community endurance testing on similar continuous-write applications suggests 128GB is the practical minimum for multi-day retention; 256GB or 512GB provides a more comfortable buffer. TP-Link’s own compatibility documentation notes that recording settings directly affect capacity consumption—higher quality and frame rates eat storage significantly faster.

• 64GB: Budget option, 4-5 days at 1080p medium quality
• 128GB: Recommended for most users, 7-10 days at 1080p medium quality
• 256GB+: Extended retention, suitable for higher resolutions or 24/7 high-quality recording

Which SD card is best for an Android phone?

Android phones use microSD cards differently than gaming consoles or cameras, and not all phones handle them the same way. Samsung Galaxy phones, in particular, have their own quirks worth understanding before you buy.

Samsung S20 FE options

The Samsung Galaxy S20 FE supports microSD expansion up to 1TB using a hybrid SIM/microSD slot. This is a generous ceiling compared to many phones, but it comes with a caveat: the slot is shared with the second SIM in dual-SIM models. If you need two phone numbers plus storage expansion, you have to choose.

For Samsung phones, the A2 app performance class is the key specification. This rating (defined by the SD Association) guarantees a minimum of 400 read IOPS and 2000 write IOPS, which makes running apps from the card noticeably smoother. SanDisk’s compatibility guidance for the Switch ecosystem mirrors what’s relevant for Samsung phones—the A1/A2 ratings cross-apply to any Android device supporting app storage on microSD.

Speed class minimum for Samsung S20 FE should be U3 (30 MB/s write) to avoid bottlenecks when recording 4K video or running apps. Cards below U1 risk noticeable lag when accessing media stored on the card.

General Android recommendations

Different Android phones have different microSD implementations:

• Adoptable Storage (Android 6+): Some phones let the OS format the card as internal storage. This requires U3 minimum and works best with A2-rated cards.
• Portable Storage: Most phones treat the card as removable storage. U1 or U3 is sufficient depending on your use case.
• App Installation: If you plan to install apps on the card, A2 class is strongly recommended; A1 is acceptable for light use.

microSD Cards Compared

Three common use cases, three different sweet spots—the right card for gaming isn’t always right for cameras or phones.

The pattern: UHS-I and U3 are the common thread across all three use cases—cards that meet these baseline specs will work in almost any device that accepts microSD.

microSD Card Specifications

Six technical specifications to understand before you buy, and what each one means for real-world performance.

What this means: for Irish buyers, the speed class and endurance rating matter far more than capacity branding—a U3 card from a reputable brand beats a V60 card from an unknown source for everyday use cases.

How to Install and Use Your microSD Card

Proper installation matters more than most people realise—a rushed insertion can corrupt data or damage the card’s contacts. These steps apply broadly across Nintendo Switch and most Android devices with microSD slots.

1. Power off your device completely before inserting or removing the card. Nintendo specifically warns against hot-swapping on the Switch to avoid data corruption.
2. Locate the microSD slot. On Nintendo Switch it’s behind the kickstand. On Samsung phones it’s usually in the SIM tray. Consult your device manual if unsure.
3. Insert the card carefully, ensuring it’s oriented correctly—the card should click into place with a light press. A “bounce back” sensation means it’s not seated properly; try again.
4. Power on and format if prompted. Switch will ask you to format new cards automatically. On Android, go to Settings > Storage > SD card to configure how you want to use it.
5. Verify the card is recognised by checking available storage space. If your Switch shows the wrong capacity, the card may not be fully compatible—try a system update first.

Only microSD Express cards can be used with a Nintendo Switch 2 console. Standard microSD cards from the original Nintendo Switch are not compatible for storing games or save data on Nintendo Switch 2.

— Nintendo UK Support (Switch 2), Official Nintendo

Nintendo eShop Cards are compatible only for the Nintendo eShop country or region where they were intended to be sold. This means EU-region eShop cards work in Ireland, but non-EU cards may not be refundable if purchased.

— Nintendo UK Support (Regional Compatibility), Official Nintendo

For Irish buyers, the stakes are practical and financial. A mis bought card means a trip back to Currys or Tesco, a potential compatibility issue, or—if you’re running a security camera—undetected footage gaps at the worst possible moment. The good news is that the specs are consistent enough across brands that you don’t need to overthink the brand itself. SanDisk, Samsung, Lexar, and Kingston all reliably meet the U3/UHS-I standards that cover the majority of Irish households’ needs.

Related reading: MB to GB conversion · Apple AirPods Max worth it?

Beyond Irish stores like Currys, the NZ micro SD retailer guide offers insights on capacities and speeds for Switch and cameras.

Frequently asked questions