A dash cam repeatedly fills and overwrites its memory card, creating far more write cycles than a phone, drone or ordinary camera. The best card under $30 should therefore be a genuine high-endurance model with enough sustained write speed, verified capacity and clear dash-cam support.
The PNY PRO Elite High Endurance 128GB 2-Pack is the best overall value when available near its $30 target price because each card is U3/V30 rated and designed for tens of thousands of recording hours. The Samsung PRO Endurance 64GB offers the strongest endurance rating for one card in this budget, while the SanDisk High Endurance 64GB is the easiest widely available V30 choice.
Important: A high-endurance card does not give a dash cam 24/7 power. Parking-mode recording requires a compatible hardwire kit, battery pack or always-powered outlet with low-voltage protection. Without that power setup, the camera stops when the vehicle turns off.
Quick Answer
Choose the PNY PRO Elite High Endurance for the best combination of capacity, V30 speed and multi-card value. Choose the Samsung PRO Endurance 64GB for the highest published endurance within the budget. Choose the Kingston High Endurance 64GB for a lower-cost 1080p dash cam.
How We Chose
We compared current U.S. pricing, published recording endurance, minimum video-speed class, sequential write performance, operating-temperature range, warranty, package quantity, capacity and suitability for single-, dual- and multi-channel dash cams.
Four Features That Matter Most
Quick Comparison
| Rank | Dash Cam Card | Capacity | Speed Class | Read / Write | Published Endurance | Warranty | Price Seen | Best For |
|---|---|---|---|---|---|---|---|---|
| 1 | PNY PRO Elite High Endurance | 2 × 128GB | U3 / V30 / A2 | Up to 100 / 90MB/s | 34,400 hours per card | 2 years | About $29.99 | Best overall value |
| 2 | Samsung PRO Endurance | 64GB | U1 / V10 / Class 10 | Up to 100 / 30MB/s | 35,040 hours | 3 years | About $24–$29 | Longest endurance |
| 3 | SanDisk High Endurance | 64GB | U3 / V30 / Class 10 | Up to 100 / 40MB/s | 5,000 hours | 2 years | $26.99 | Wide compatibility |
| 4 | Kingston High Endurance | 64GB | U1 / V10 / A1 | Up to 95 / 30MB/s | 26,900 operating hours | 3 years | $14.95 | Budget 1080p |
| 5 | Gigastone MLC High Endurance | 64GB | U3 / V30 / Class 10 | Up to 100 / 65MB/s | MLC endurance claim | 5 years listed | $13.99 | MLC budget pick |
| 6 | Lexar High-Endurance | 64GB | U3 / V30 class | Up to 100 / 35MB/s | 6,000 hours | Limited warranty | Usually under $30 | Low-cost 4K |
| 7 | Delkin DASHCARD | 32GB | U3 / V30 / Class 10 | Up to 95 / 85MB/s | 70,000+ hour series | Lifetime listed | $29.99 | Premium small card |
PNY PRO Elite High Endurance
Samsung PRO Endurance
SanDisk High Endurance
Kingston High Endurance
Gigastone MLC High Endurance
Lexar High-Endurance
Delkin DASHCARD
Detailed Reviews
PNY PRO Elite High Endurance 128GB 2-Pack — Best Overall Value
Two fast endurance cards for rotating, testing and keeping a ready spareVerdict: This PNY pack offers the strongest combination of capacity, V30 speed and redundancy when the two-card package remains near $30.
Each 128GB card is designed for continuous monitoring and rated for up to approximately 34,400 hours of Full HD recording under PNY’s specified test conditions.
The U3 and V30 ratings guarantee a minimum sustained write speed of at least 30MB/s. That makes the card better suited than U1 models for 4K, high-bitrate or front-and-rear dash cams.
Maximum read and write ratings reach approximately 100MB/s and 90MB/s. Dash cams rarely need that full sequential speed, but faster transfers can reduce the time required to copy incident footage to a computer.
The two-card package is especially practical. One card can remain inside the camera while the second serves as a tested spare or allows footage to be preserved without immediately returning the original card to service.
A2 application performance is not important for dash-cam recording, but it does not reduce compatibility when the camera supports the card’s capacity and file system.
The most important limitation is price volatility. The package may move above $30 because flash-memory prices and marketplace inventory change frequently.
Why It Ranks First
- Two 128GB cards can cost less than one premium endurance card.
- V30 rating supports demanding video bitrates.
- Published endurance is strong for the price.
- High write speed reduces the risk of buffer-related recording errors.
- A spare card simplifies troubleshooting and evidence preservation.
- Suitable for Full HD and 4K-class monitoring devices.
Watch out: Confirm that the listing contains two genuine 128GB PRO Elite High Endurance cards. PNY sells similarly named PRO Elite, Elite and Premier cards that are not the same product.
Pros
- Excellent capacity per dollar
- Two-card redundancy
- U3 and V30 rated
- Fast maximum write speed
- Strong published endurance
- Useful for 4K and dual-channel models
Cons
- Price and package quantity can change
- Two-year warranty is shorter than some rivals
- Not every dash cam supports 128GB
- Model names are easy to confuse
Samsung PRO Endurance 64GB — Best Long-Endurance Single Card
A strong choice for Full HD and moderate-bitrate parking-mode recordingVerdict: Samsung PRO Endurance 64GB provides the highest published Full HD recording endurance among the single cards in this budget, but its V10 rating makes it better for 1080p and moderate bitrates than demanding 4K multi-camera setups.
Samsung rates the 64GB version for up to 35,040 hours of Full HD recording at its specified test bitrate. That figure is much higher than the published rating of many inexpensive endurance cards.
The card reads at up to 100MB/s and writes at up to approximately 30MB/s. Its Class 10, U1 and V10 ratings guarantee at least 10MB/s of sustained writing.
That is sufficient for many 1080p and 2K dash cams, but some 4K or multi-channel models specifically require U3 or V30 cards. Follow the camera manufacturer’s recommendation rather than relying only on the maximum write-speed number.
Samsung lists resistance to water, temperature extremes, X-rays, magnetic fields, drops and wear. The card is rated to operate from approximately -13°F to 185°F.
The 64GB capacity receives a three-year limited warranty. Higher-capacity Samsung versions receive longer warranties, but may cost more than $30 during current storage-market conditions.
Because this is a popular model, counterfeit risk is significant. Purchase from Samsung or an authorized retailer and inspect the packaging carefully.
Watch out: The 64GB version is V10, not V30. Check the dash-cam manual before using it in a high-bitrate 4K, dual-4K or triple-channel system.
Pros
- Excellent published endurance
- Designed for monitoring devices
- Broad environmental protection
- Three-year warranty
- Recognized flash-memory manufacturer
- Strong choice for Full HD parking mode
Cons
- Only V10 at 64GB
- Less storage than 128GB options
- Counterfeit risk
- Current pricing can approach $30
SanDisk High Endurance 64GB — Best Widely Available Pick
A straightforward V30 card from a brand stocked by many major retailersVerdict: SanDisk High Endurance 64GB is the safest mainstream purchase when you need a genuine V30 dash-cam card quickly from an established U.S. retailer.
The card is specifically marketed for dash cams and home-monitoring systems. Its V30 and U3 ratings guarantee at least 30MB/s sustained writing for compatible recording devices.
Maximum read and write speeds are listed at approximately 100MB/s and 40MB/s. That is enough for Full HD and many 4K dash cams, provided the camera supports 64GB microSDXC cards.
SanDisk rates the 64GB version for up to 5,000 hours of Full HD recording. That is lower than Samsung, PNY and Kingston’s published figures, but the card remains a reliable balance of speed, compatibility and availability.
Environmental protection includes resistance to temperature extremes, water, shock and X-rays. The operating range extends from approximately -13°F to 185°F.
A two-year limited warranty is included. SanDisk’s MAX Endurance line offers much higher endurance and a longer warranty, but current prices frequently exceed this guide’s $30 limit.
The white card design is easy to identify, but counterfeit listings remain common. Avoid suspicious third-party sellers with prices far below recognized retailers.
Watch out: SanDisk High Endurance and MAX Endurance are different product lines. MAX Endurance lasts longer but usually costs more.
Pros
- U3 and V30 rated
- Widely available
- Clear dash-cam positioning
- Good environmental protection
- Fast file transfers
- Easy to replace while traveling
Cons
- Lower published endurance than top picks
- Only two-year warranty
- 64GB fills quickly in multi-channel cameras
- Counterfeit risk
Kingston High Endurance 64GB — Best Budget 1080p Pick
A low-cost card for Full HD cameras that do not require V30 speedVerdict: Kingston High Endurance 64GB is the best inexpensive choice for a standard 1080p dash cam that accepts U1 or V10 cards.
The current Kingston line is designed for dash cams, body cameras and surveillance equipment that writes continuously or for long periods.
The 64GB version reaches up to approximately 95MB/s read and 30MB/s write. Its U1 and V10 classifications guarantee at least 10MB/s sustained writing.
Kingston lists up to 26,900 operating hours for 24/7 recording within the product’s three-year warranty framework. Actual card life varies with bitrate, camera temperature and rewriting patterns.
The card includes protection against temperature extremes, shock, water and X-rays. Its operating range is approximately -13°F to 185°F.
At the researched retailer price, it costs substantially less than SanDisk while providing a stronger published endurance figure.
The limitation is speed class. Some 4K and high-bitrate dash cams reject U1 cards or display repeated slow-card errors even when the maximum write speed appears adequate.
Watch out: Do not buy this card for a dash cam that specifically requires U3 or V30. Maximum write speed and guaranteed minimum speed are different specifications.
Pros
- Excellent current price
- Strong published operating hours
- Three-year warranty
- Designed for continuous recording
- Broad environmental protection
- Recognized memory brand
Cons
- Only U1 and V10
- Not ideal for demanding 4K cameras
- 64GB retention is limited
- Lower transfer speed than PNY
Gigastone 64GB MLC High Endurance — Best MLC Budget Pick
A fast inexpensive option with MLC positioning and a long listed warrantyVerdict: Gigastone provides attractive specifications for the price, but buyers should verify the exact MLC model, seller and warranty eligibility carefully.
The specific 64GB model is advertised with MLC flash and a lifespan significantly longer than normal consumer microSD cards.
Its U3 and V30 ratings provide a guaranteed sustained write level suitable for many 4K and multi-channel dash cams.
Maximum read and write speeds are listed at approximately 100MB/s and 65MB/s, making it faster on paper than several cards costing more.
The card is promoted as waterproof, shockproof, temperature resistant and X-ray resistant. A five-year manufacturer warranty is listed for supported products and regions.
The low retailer price makes it appealing as a backup or secondary card. It also provides a way to test whether a dash cam’s slow-card problems are caused by the original media.
Gigastone has a smaller U.S. retail and support presence than Samsung, SanDisk or Kingston. Buy only from a seller that clearly identifies the exact model and accepts returns.
Watch out: Gigastone sells several high-endurance and camera cards with different flash types and speed ratings. Confirm that the listing explicitly says MLC, U3 and V30.
Pros
- Very low researched price
- MLC flash claim
- U3 and V30 speed rating
- Fast listed write speed
- Five-year warranty listed
- Useful as a spare card
Cons
- Smaller U.S. support network
- Several similar model names
- Seller quality varies
- Published endurance is less standardized
Lexar High-Endurance 64GB — Best Low-Cost 4K Alternative
A V30-class endurance card for buyers who find it below the SanDisk priceVerdict: Lexar High-Endurance is a reasonable V30 alternative when it is sold by a reputable retailer for less than the equivalent SanDisk card.
Lexar designed the series for dash cams, body cameras and surveillance systems that continuously record and overwrite video.
The 64GB card is rated for up to approximately 6,000 hours of recording under Lexar’s specified Full HD conditions. The 128GB version doubles that rating but may exceed $30 depending on inventory.
Read speed reaches up to approximately 100MB/s, while the 64GB version is commonly listed with write performance around 35MB/s.
A U3 or V30-rated version is appropriate for many 4K cameras. Buyers should confirm the speed symbols on both the listing and package because older regional versions may differ.
The card is designed to resist temperature extremes, water, shock, vibration and X-rays. Such protections do not prevent wear caused by repeated writing.
Availability in the United States is less consistent than SanDisk or Samsung. Avoid substituting a Lexar High-Performance or E-Series card simply because it has a similar color or capacity.
Watch out: Lexar High-Endurance, High-Performance and SILVER cards serve different purposes. Confirm that the product name includes High-Endurance.
Pros
- Designed for continuous recording
- V30-class option
- Good read speed
- Environmental protection
- Often affordable at 64GB
- Useful alternative to SanDisk
Cons
- U.S. availability varies
- Several similar Lexar product lines
- Lower endurance than Samsung
- Package specifications require verification
Delkin DASHCARD 32GB — Best Premium Card for Legacy Dash Cams
A fast dedicated dash-cam card for cameras limited to 32GB storageVerdict: The 32GB DASHCARD is expensive per gigabyte, but it is a strong option for older or entry-level dash cams that cannot use 64GB or 128GB microSDXC cards.
Delkin designed the DASHCARD series specifically for continuous-loop recording in dash cameras rather than general mobile-device storage.
The U3 and V30 ratings guarantee a minimum sustained write speed of 30MB/s, while maximum write performance reaches up to approximately 85MB/s.
Delkin advertises the series for more than 70,000 hours of use, although endurance can vary by capacity, recording format and camera workload.
A limited lifetime warranty and U.S.-based support add value for buyers who want a specialized card rather than a low-cost marketplace option.
The 32GB capacity holds relatively little high-bitrate video. It is most useful when the dash cam’s manual sets a strict 32GB maximum.
When the camera supports 64GB or 128GB, the PNY, Samsung, Kingston or SanDisk options provide more recording retention per dollar.
Watch out: Thirty-two gigabytes can store only a few hours of high-bitrate or multi-channel video before loop recording overwrites older clips.
Pros
- Designed specifically for dash cams
- U3 and V30 rated
- Fast listed write speed
- Lifetime warranty listed
- U.S.-based support
- Fits legacy 32GB limits
Cons
- Very expensive per gigabyte
- Short recording retention
- Uses the full $30 budget
- Unnecessary for cameras supporting larger cards
What Capacity Do You Need?
32GB
Best for older dash cams with strict capacity limits. It fills quickly and provides a short evidence window before older footage is overwritten.
64GB
A practical choice for single-channel 1080p cameras and moderate parking-mode use. It remains the easiest capacity to keep under $30.
128GB
Better for 2K, 4K, dual-channel and long parking sessions. Confirm that the dash cam officially supports microSDXC and 128GB capacity.
Approximate Recording Time by Bitrate
| Capacity | 25Mbps | 50Mbps | 75Mbps | 100Mbps |
|---|---|---|---|---|
| 32GB | About 2.8 hours | About 1.4 hours | About 57 minutes | About 43 minutes |
| 64GB | About 5.7 hours | About 2.8 hours | About 1.9 hours | About 1.4 hours |
| 128GB | About 11.4 hours | About 5.7 hours | About 3.8 hours | About 2.8 hours |
| 256GB | About 22.8 hours | About 11.4 hours | About 7.6 hours | About 5.7 hours |
These are simplified estimates before file-system overhead, protected event clips, parking files and audio. Actual retention depends on codec, frame rate, number of cameras, HDR mode and the dash cam’s file-management settings.
Dual-channel warning: A front-and-rear dash cam writes two video streams simultaneously. A triple-channel system writes three. Total bitrate, card wear and storage consumption can therefore be much higher than the resolution label suggests.
U1, U3, V10 and V30 Explained
Class 10
Guarantees at least 10MB/s sequential writing under the older speed-class system. It is common but does not prove high endurance.
U1
Guarantees at least 10MB/s sustained writing. It is usually adequate for standard Full HD recording.
V10
Guarantees at least 10MB/s sustained video writing. It is similar to U1 for minimum write performance.
U3
Guarantees at least 30MB/s sustained writing and is safer for higher-bitrate video.
V30
Guarantees at least 30MB/s sustained video writing. It is the preferred minimum for many 4K and multi-channel dash cams.
Maximum Write Speed
This is a best-case sequential figure. The guaranteed U or V class is more useful for judging uninterrupted video recording.
A card can advertise “up to 90MB/s write” but still have a lower guaranteed sustained rating. Follow the speed class required in the dash-cam manual.
High Endurance vs Normal microSD Cards
A standard consumer card is optimized for storing apps, photos, games and files that are written occasionally. A dash cam may overwrite the entire card repeatedly every day.
High-endurance models use flash, controllers, firmware and wear-leveling strategies intended for heavier write cycles. They also normally receive warranties that explicitly include monitoring or dash-cam use.
Some high-speed consumer cards have lifetime warranties that exclude continuous recording. A long warranty does not help when the intended dash-cam workload is excluded from coverage.
Does MLC Automatically Mean Better?
MLC flash traditionally stores fewer bits per memory cell than TLC or QLC, which can improve write endurance. However, the complete card design matters more than one NAND label.
Controller quality, wear leveling, overprovisioning, error correction, firmware and manufacturing consistency all affect reliability. A genuine endurance card from a major brand may be safer than an unknown MLC card with vague specifications.
How to Install and Format a Dash Cam microSD Card
- Turn the dash cam off completely.
- Insert the microSD card in the correct orientation without forcing it.
- Power the camera on.
- Open the dash cam’s settings menu or companion app.
- Select the in-camera format option.
- Allow the format to finish without disconnecting power.
- Confirm that recording begins normally.
- Record several minutes of test footage.
- Remove the card safely and play the files on a computer.
- Return the card to the camera and format it again before regular use.
Why Format Inside the Dash Cam?
The camera can create the file system, folders, allocation size and protected-file structure it expects. Computer formatting may use an incompatible file system or allocation unit.
How Often Should You Format?
Follow the dash-cam manufacturer’s recommendation. Many users format monthly or every few weeks, while fleet or heavy parking-mode use may justify more frequent checks.
Formatting does not repair worn-out flash memory. Replace a card that repeatedly produces errors after correct in-camera formatting.
24/7 Recording and Parking Mode
A memory card records only when the dash cam receives power. Most vehicle accessory outlets turn off with the ignition, so continuous parking recording normally requires additional hardware.
Common Power Options
- A hardwire kit connected to suitable vehicle fuse circuits.
- A dedicated dash-cam battery pack.
- An always-powered 12V outlet with safe low-voltage protection.
- A vehicle-specific integrated dash-cam power connection.
Why Low-Voltage Protection Matters
A camera that records for too long can discharge the vehicle’s starter battery. A proper hardwire kit should stop recording before battery voltage becomes unsafe.
Parking-mode duration also depends on camera power consumption, battery condition, temperature, hardwire cutoff and whether the camera records continuously, by time lapse or only after motion or impact.
Installation safety: Incorrect fuse taps, wiring or airbag-area cable routing can damage the vehicle or create a safety hazard. Use the dash-cam instructions or a qualified installer.
Signs a Dash Cam microSD Card Is Failing
- The camera repeatedly says “memory-card error” or “format card.”
- Recording stops without warning.
- Video files are missing, zero bytes or impossible to open.
- The camera restarts when writing a file.
- Parking-mode files disappear.
- Clips contain frozen frames or large time gaps.
- The card becomes read-only.
- Formatting fails inside the camera.
- Capacity appears smaller than the label.
- Write speed tests are far below the rated class.
What to Do After an Error
- Stop recording over the card when important footage may still be present.
- Copy accessible files to another drive.
- Test the card in a reliable reader.
- Verify the real capacity with reputable memory-testing software.
- Format the card inside the dash cam.
- Replace it when errors return.
How to Avoid Counterfeit microSD Cards
- Buy from the manufacturer or an authorized retailer.
- Avoid marketplace sellers with no history or contact information.
- Compare the exact model number with the manufacturer’s page.
- Inspect printing quality, spelling and packaging seals.
- Test the complete usable capacity after purchase.
- Check sequential writing against the rated speed class.
- Keep the receipt and packaging for warranty claims.
- Be suspicious when the price is dramatically lower than every major retailer.
How Often Should a Dash Cam Card Be Replaced?
There is no universal replacement schedule. A card in a one-hour-per-day 1080p commute has a much easier workload than a triple-channel 4K system recording parking footage all night.
Heavy users can inspect footage monthly, maintain a tested spare and replace the card proactively when it approaches the manufacturer’s endurance estimate or begins showing errors.
Important footage should be copied immediately. A dash-cam memory card is temporary loop-recording storage, not a permanent archive.
What to Avoid
Dash Cam Memory-Card Buying Mistakes
- Buying a normal phone or gaming card: speed alone does not guarantee continuous-write endurance.
- Ignoring the capacity limit: older cameras may reject 64GB, 128GB or SDXC cards.
- Buying U1 for a V30-required camera: the dash cam may stop recording or show slow-card errors.
- Choosing the largest card without checking formatting: some cameras require FAT32 while larger cards arrive as exFAT.
- Trusting only the maximum write speed: check the guaranteed U or V speed class.
- Buying suspiciously cheap marketplace cards: counterfeit capacity and relabeled flash are common.
- Never checking recorded files: a camera can appear to work while saving corrupted clips.
- Removing the card while recording: this can corrupt files and the file system.
- Using one card forever: all flash memory wears out after enough rewriting.
- Treating the card as permanent evidence storage: copy important clips to another device immediately.
Related Guides
Final Verdict
The PNY PRO Elite High Endurance 128GB 2-Pack is the best overall value when the package remains near $30. It provides two high-capacity U3/V30 cards, strong published endurance and enough write performance for demanding dash cams.
The Samsung PRO Endurance 64GB is the best long-endurance single card within the budget. Its 35,040-hour Full HD rating is impressive, but its V10 classification makes it most appropriate for Full HD and moderate-bitrate recording.
Choose the SanDisk High Endurance 64GB when you want a V30 card that is easy to find from established U.S. retailers. It provides less published endurance than Samsung but broader high-bitrate compatibility.
The Kingston High Endurance 64GB is the best inexpensive card for 1080p dash cams that accept U1 or V10 media. The Gigastone MLC High Endurance 64GB provides unusually strong specifications for its price, but the exact model and seller require careful verification.
Choose the Lexar High-Endurance 64GB as a sale-priced V30 alternative. The Delkin DASHCARD 32GB is the best premium option for an older camera that cannot accept more than 32GB.
Before ordering, check the dash cam’s maximum capacity and required speed class. A genuine 64GB endurance card that the camera fully supports is better than a larger, faster card the camera cannot format or record to reliably.
Frequently Asked Questions
What is the best dash cam microSD card under $30?
The PNY PRO Elite High Endurance 128GB 2-Pack is the best overall value when available near $30 because it combines high capacity, V30 speed and a spare card.
Do dash cams need high-endurance microSD cards?
Yes. Dash cams continuously write and overwrite video, creating much heavier flash wear than normal phone, camera or gaming use.
What capacity is best for a dash cam?
64GB is suitable for many single-channel cameras. A 128GB card provides longer retention for 2K, 4K, dual-channel and parking-mode recording when supported.
Is 32GB enough for a dash cam?
It works for older cameras and short recording windows, but high-bitrate or multi-channel footage can overwrite old clips quickly.
Can I use a 128GB card in every dash cam?
No. The camera must support microSDXC, the capacity and the required file system. Check the manual before buying.
Is V30 necessary for a dash cam?
It is recommended for many 4K and multi-channel cameras. Standard 1080p models may work with U1 or V10 cards when the manufacturer approves them.
What does V30 mean?
V30 guarantees a minimum sustained video write speed of 30MB/s.
What is the difference between U1 and U3?
U1 guarantees at least 10MB/s sustained writing, while U3 guarantees at least 30MB/s.
Is a faster normal microSD card better than a high-endurance card?
Not necessarily. A normal card may be fast but not designed or warranted for constant rewriting.
Can a microSD card make 24/7 recording work?
No. The card stores footage, but the dash cam still needs continuous power, parking-mode support and safe battery protection.
How much video fits on a 64GB card?
At a total bitrate of 25Mbps, approximately 5.7 hours fits before overhead. At 50Mbps, the estimate falls to about 2.8 hours.
How much video fits on a 128GB card?
At 25Mbps, approximately 11.4 hours fits before overhead. At 50Mbps, the estimate is about 5.7 hours.
Does a dual-channel dash cam use more storage?
Yes. It records front and rear video simultaneously, increasing total bitrate, storage use and card wear.
How often should I format a dash cam card?
Follow the camera manufacturer’s schedule. Many users format every few weeks or monthly and inspect saved footage regularly.
Should I format the card on a computer or in the dash cam?
Use the in-camera format function whenever possible so the correct file system and folder structure are created.
How long does a dash cam microSD card last?
Lifespan depends on card endurance, bitrate, temperature, daily recording time and the number of camera channels. Published hours are estimates under specific conditions.
How do I know when a microSD card is failing?
Warning signs include missing clips, repeated format errors, recording stops, corrupted files, camera restarts and a card becoming read-only.
Can I recover footage from a failed card?
Sometimes. Stop using the card immediately, copy accessible files and use reputable recovery software or a professional service for critical evidence.
Are counterfeit microSD cards common?
Yes. Buy from authorized sellers, verify the model number and test the full capacity and write speed after purchase.
Should I keep a spare dash cam card?
Yes. A tested spare allows immediate replacement and lets you preserve an incident card without overwriting important footage.