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The Samsung PRO Endurance 256GB is our first choice for a compatible security camera that records continuously. Choose the SanDisk MAX Endurance 256GB if its longer limited warranty matters most, or the SanDisk High Endurance 256GB when it costs meaningfully less. Before ordering, check your camera’s exact hardware version and supported capacity.
Best for continuous recording
Samsung PRO Endurance 256GB
Our starting point for a compatible camera recording all day, with capacity-specific endurance claims and U3/V30 speed classes.
- 256GB microSDXC; Class 10, U3, V30
- Up to 140,160 hours of rewriting at Samsung’s stated Full HD bitrate
- 5-year limited card warranty
Best long-warranty pick
SanDisk MAX Endurance 256GB
A monitoring-focused card with the longest limited warranty of these three exact 256GB choices.
- 256GB microSDXC; Class 10, U3, V30
- Up to 120,000 hours of Full HD recording and rewriting
- 15-year limited warranty for 256GB
Value pick when cheaper
SanDisk High Endurance 256GB
A practical alternative for event recording when the price is meaningfully lower than PRO or MAX Endurance.
- 256GB microSDXC; Class 10, U3, V30
- Up to 20,000 hours of Full HD recording and rewriting
- 2-year limited warranty
A security camera repeatedly writes and replaces video, sometimes around the clock. An endurance-rated card is designed for that workload. The right purchase also depends on how much footage you need to keep, whether the camera records continuously or only on detection, and how easily you can reach it to replace a card.
Best microSD cards for security cameras at a glance
| 256GB card | Rated rewrite hours* | Limited warranty |
|---|---|---|
| Samsung PRO Endurance | Up to 140,160 hours | 5 years |
| SanDisk MAX Endurance | Up to 120,000 hours | 15 years |
| SanDisk High Endurance | Up to 20,000 hours | 2 years |
*These are manufacturers’ cumulative recording-and-rewriting claims under specified conditions, not hours of footage held at once or guaranteed service lives. Samsung specifies Full HD at 26Mbps; SanDisk specifies Full HD and warns that total hours are lower with 4K. The figures are not a standardized head-to-head reliability test.
Samsung PRO Endurance 256GB: best starting point for continuous recording
Samsung’s current 256GB PRO Endurance, model MB-MJ256KA/AM, combines a surveillance-focused design with Class 10, U3 and V30 ratings. Samsung specifies up to 100MB/s reading and 40MB/s writing. Those are advertised maximums; a camera’s interface can deliver less. The 256GB model’s endurance claim is up to 140,160 hours at the stated Full HD test bitrate, with a five-year limited warranty.
It is our default shortlist pick for a plugged-in camera running an all-day schedule, provided the camera supports the capacity. Be careful with comparisons that call every PRO Endurance card U1: Samsung’s smaller capacities and older generations have different specifications. Match the model and markings. The Samsung US product sheet details the capacity-specific differences.
SanDisk MAX Endurance 256GB: best for a longer limited warranty
The MAX Endurance 256GB, SDSQQVR-256G-GN6IA, is another purpose-built monitoring card. It carries Class 10, U3 and V30 ratings, advertised read/write speeds up to 100/40MB/s, and a manufacturer endurance claim up to 120,000 hours of Full HD recording and rewriting.
Its clearest distinction is the 15-year limited warranty on this capacity. Smaller MAX Endurance cards have shorter coverage. Consider it when the price premium is modest or the camera is mounted somewhere inconvenient. A long warranty cannot recover a missed incident, so it does not remove the need to check playback and keep copies of important clips. See SanDisk’s specifications and capacity-specific warranty periods.
SanDisk High Endurance 256GB: best value when the price is lower
The High Endurance 256GB, SDSQQNR-256G-GN6IA, is worth considering for an event-recording camera or a lower-cost multi-camera installation. It has Class 10, U3 and V30 markings and advertised read/write speeds up to 100/40MB/s, matching the speed classes of the other picks.
The trade-off is its lower published rewrite endurance and shorter warranty: up to 20,000 hours of Full HD recording and two years of limited coverage. SanDisk’s headline 40,000-hour figure belongs to the 512GB version. Check the capacity table in SanDisk’s datasheet. If the three cards are close in price, we would favor PRO Endurance or MAX Endurance for a demanding continuous-recording installation.
Check capacity against your exact camera
These are the published limits checked on October 11, 2026. A limit describes the camera’s supported capacity; it does not certify every brand and card variant. Update firmware, check the hardware label, and test recording and playback after installation.
| Camera | Published maximum | Important detail |
|---|---|---|
| Tapo C120 V1 | 512GB | US V1 page; supports continuous recording |
| Tapo C120 V2 | 512GB | Check V2 documentation separately |
| Tapo C425 | 512GB | Battery camera; detection recording, not continuous recording |
| Wyze Cam v4 | 256GB | Current support specifies exFAT |
| Aqara Camera E1 | 512GB | Local continuous or event recording |
| Reolink Argus 4 Pro | 512GB | Triggered recording; format through Reolink |
For Wyze Cam v4, use the current 256GB support limit rather than older 512GB references. Conversely, current Reolink documentation lists 512GB for Argus 4 Pro; older 128GB listings can mislead. Tapo’s tested-card list recommends endurance ranges but lists particular capacities, not every 256GB card here. We have not independently tested these camera/card combinations.
Buying a larger card does not add a recording mode. Tapo’s continuous-recording guide excludes battery-powered cameras such as the C425. Reolink lists triggered recording for Argus 4 Pro. Their history depends on the events they actually capture.
How much footage will 256GB hold?
Use bitrate to estimate retention. Resolution alone cannot tell you how many days a card stores: compression, frame rate, scene movement, audio and recording settings all affect the data written.
For a single continuously recorded stream, approximate hours equal usable capacity in GB multiplied by 8,000, divided by the product of bitrate in Mbps and 3,600. Using the full nominal 256GB gives these illustrative upper estimates:
| Average recorded bitrate | Approximate 256GB retention |
|---|---|
| 2Mbps | 284 hours, about 11.9 days |
| 4Mbps | 142 hours, about 5.9 days |
| 8Mbps | 71 hours, about 3.0 days |
Allow for formatting, reserved space, additional recorded streams and bitrate variation. These are arithmetic examples, not measured results for the cameras above. At the same settings, 128GB holds about half as much and 512GB about twice as much. Motion-only recording may span many more calendar days, but a busy entrance can fill storage far faster than a quiet room.
Install it, enable looping, then verify playback
- Buy from a trustworthy seller. Check the seller as well as the marketplace. Counterfeit capacity can cause formatting failures and missing recordings.
- Back up existing files before formatting. Formatting erases the card. Follow the camera’s installation instructions and use its app to initialize storage.
- Choose the intended schedule. Enable local recording and continuous or event recording as supported. Check the overwrite or loop setting.
- Play back a fresh clip. Confirm the timestamp and that footage is available after leaving live view. Recheck periodically and after firmware changes.
File-system requirements differ: Wyze specifies exFAT for its v4’s supported large cards, while Reolink specifies FAT32 and supports formatting in its app or client. Avoid applying one brand’s computer-formatting instructions to every camera.
Still deciding where recordings should live? Our microSD vs. hub vs. NVR guide covers storage-location tradeoffs. For a camera that writes around the clock, see our continuous-recording camera guide.
Frequently asked questions
Do security cameras really need high-endurance microSD cards?
They are the sensible starting point for repeated video recording, especially 24/7 use. A general-purpose card may operate, but its speed label alone says little about its intended rewrite workload. Check both the camera’s requirements and the card manufacturer’s monitoring-use and warranty terms.
Is 128GB, 256GB or 512GB the better size?
Start with the supported maximum, then work backward from the history you need. A compatible 256GB card offers more retention than 128GB at identical settings. Choose 512GB only if your exact camera supports it and the extra footage is useful. A lower-resolution, event-only camera may need much less.
Does V30 mean a card lasts longer?
No. V30 is a video write-speed class, specifying 30MB/s under the standard’s conditions with a compatible host. It is separate from write endurance. All three selected 256GB cards carry V30, but their published endurance claims and warranties differ. Follow the SD Association’s guidance to match card and device speed classes.
What happens when the card becomes full?
With loop recording enabled, a supporting camera overwrites its oldest eligible footage. Without overwrite enabled, recording may stop. Save important clips elsewhere promptly: buying a larger card delays overwriting but does not make local recordings permanent. Verify your particular camera’s setting instead of assuming looping is on.
Will an endurance rating guarantee years of reliable footage?
No. Recording-hour claims describe cumulative rewriting under manufacturer conditions. They neither promise uninterrupted operation nor describe how much history stays on the card. Warranty duration is another separate measure. If recordings develop gaps or storage errors return after troubleshooting, investigate promptly and replace a suspect card.
How Entry Scout evaluates products
Compatibility → features → total cost → who it’s best for.
We start with the exact camera, hardware version, supported capacity and file-system requirements. We then compare monitoring-specific endurance claims, required speed classes and capacity-specific warranty terms. Total cost includes buying enough usable storage and the inconvenience of reaching a mounted camera to replace its card. Our recommendations distinguish continuous-recording installations from lighter event-recording workloads.
This is a research-based guide, not a hands-on endurance test. We checked manufacturer documentation and exact US 256GB retailer listings on October 11, 2026. We did not assign benchmark scores or claim universal compatibility. Retention examples are our calculations. Prices and seller availability can change, so the value recommendation depends on the offers available when you buy.
Sources include the Samsung US specification sheet, SanDisk endurance warranty guide, and the model-specific Tapo, Wyze, Aqara and Reolink documentation linked above.