Batteries, cards & accessories
Choosing an SD card for a trail camera
Match the card type and maximum size to your camera's manual, pick a fast enough speed class for your video, and format it in the camera.
- Time
- 10 minutes
- Difficulty
- Easy
- Cost
- Low cost
- Steps
- 7
- Checked
What you’ll need
- SD card of the type your camera takes Search Amazon for SD card class 10 U3
- Card reader for your computer Search Amazon for SD card reader USB
As an Amazon Associate we earn from qualifying purchases. The Amazon links go to search results, so you can compare what’s available.
Safety first
- Formatting deletes everything on the card, so back up first.
- Don't remove the card while the camera is switched on.
Step by step
-
Step 1: Check the card type and maximum size in your manual
Cameras take either full-size SD or microSD, and each has a maximum capacity. Limits vary widely, even within one brand. Spartan lists 32 GB for some models and up to 128 GB or 512 GB for others. Bushnell's Cellucore manual says up to 32 GB. Buying a bigger card than the camera supports can mean it isn't recognised.
Next: step 2 -
Step 2: Understand SDHC vs SDXC
The SD Association defines SDHC as over 2 GB up to 32 GB (formatted FAT32) and SDXC as over 32 GB up to 2 TB (formatted exFAT). A camera that only supports SDHC (up to 32 GB) may not work with an SDXC card.
Next: step 3 -
Step 3: Choose the right speed class
Speed classes mark a guaranteed minimum write speed: Class 10 and U1 are 10 MB/s, and U3 and V30 are 30 MB/s. Bushnell asks for class 6 or higher for video, and class 10 for its recommended cards. For 4K video, choose U3/V30. The SD Association advises choosing a card with the same or a higher symbol than your device asks for.
Next: step 4
-
Step 4: Avoid adapters if your camera dislikes them
Some makers say not to use a microSD card in an SD adapter. Spartan lists this as 'do not use' for several models. If your camera takes full-size SD, buy a full-size card.
Next: step 5 -
Step 5: Format the card in the camera
Spartan says every card should be formatted in the camera when inserted, and other makers give similar advice. It sets up the card the way that camera expects. Formatting erases everything, so copy your files off first.
Next: step 6 -
Step 6: Swap cards with the camera switched off
Turn the camera off before inserting or removing the card, as Bushnell's manuals advise. Many people keep two cards and swap them, so they can review footage at home while the camera keeps recording.
Next: step 7 -
Step 7: Back up, then clear
MammalWeb suggests copying photos into a folder for each site, with a subfolder for each deployment date. Then format the card before the camera goes back out, so it doesn't fill up and stop recording.
Tips
- Higher video resolutions and longer clips fill cards faster. Bushnell recommends 1080p as a balance between quality and space.
- A camera that stops part-way through a deployment, or shows odd card capacity, may have a failing card. Spartan says bad cards cause many camera problems.
| Marking | Minimum write speed | Typical use |
|---|---|---|
| Class 10 (C10) | 10 MB/s | Photos, HD video |
| U1 | 10 MB/s | Photos, 1080p video |
| U3 | 30 MB/s | 4K video |
| V30 | 30 MB/s | 4K video |
| Card family | Capacity | File system |
|---|---|---|
| SDHC | Over 2 GB up to 32 GB | FAT32 |
| SDXC | Over 32 GB up to 2 TB | exFAT |
Questions people ask
What's the biggest SD card my trail camera can take?
It's in your manual. Limits vary from 32 GB on some models to 512 GB on others.
Do I need a U3 or V30 card?
For 4K video, yes, as these guarantee at least 30 MB/s. For photos and 1080p video, Class 10/U1 is usually enough. Follow your manual.
Why should I format in the camera rather than on my computer?
Makers such as Spartan recommend it so the card is set up the way the camera expects. It also clears old files.
Can I use a microSD card with an adapter?
Some cameras accept it, but several makers advise against it. Use the card type the camera is designed for.
Sources
Checked 18 October 2026. We wrote this guide in our own words, using:
- SD Association: SD/SDHC/SDXC/SDUC capacity (sdcard.org)
- SD Association: speed class (sdcard.org)
- PCWorld: how to buy the best SD card (pcworld.com)
- Reolink: what does V30 mean on an SD card (reolink.com)
- Spartan support: SD card information and recommendations (support.spartancamera.com)
- Bushnell Cellucore 30 instruction manual (copy hosted by Adorama) (adorama.com)
- MammalWeb camera trapping tips and tricks (Great North Museum) (northeastmuseums.org.uk)
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Printed from wildlifetrailcameras.co.uk/guides/choosing-an-sd-card-for-a-trail-camera/ · Checked 18 October 2026 · Research reviews, not hands-on tests: specifications come from manufacturers and findings from the independent reviewers we link to. Check the law before filming beyond your own property.