Your dashcam is destroying its own memory card (and what fixes it)TechliciousUpdatedTue, September 22, 2026 at 3:48 PM UTCAdd us on GoogleImage credit: Suzanne Kantra/Techlicious generated by ChatGPTDashcams are designed to continuously record video, which means they tend to record over their own footage very often. The issue is that most microSD cards aren't built to survive that kind of overwriting. Which could mean that the recording you need for evidence in an accident is inaccessible or corrupted. And it's not just your dashcam you need to be concerned with. Security cameras with built in recording carry this same risk.I found this out the hard way while testing a 70mai A810 dashcam back in 2023. I had a cheap new microSD card lying around that I decided to use with the dashcam. Within a couple of days of recording, the camera started showing an error that read "Memory card damaged, please replace." The card was dead and not readable even when I tried to use a reader on my PC. Luckily, I didn't lose any footage I needed, but that may not always be the case when a dashcam SD card fails. I'm not the only one on the Techlicious team who has had a card die this way.The answer to this problem is getting a high-endurance SD card, designed to be used with CCTV and dashcams. Following my SD card failure, I got a Samsung Pro Endurance card, which has worked fine ever since. I've tested a bunch of dashcams since 2021, and that remains the only card failure I've faced. Here's what you need to know to make sure your dashcam or security camera always has a working card.Why loop recording kills memory cardsYour dashcam or security camera uses loop recording. When the card fills up, the camera deletes the oldest clips and records over them, so the card is being written to continuously while the camera is on. If you have a security camera continuously recording your home, that's 24 hours a day of capture.AdvertisementAdvertisementFlash memory, like the kind used in SD cards, wears out as you write to it. Every cell on your card can take a limited number of write-and-erase cycles before it stops storing your data reliably. Regular cards have memory chips rated for lighter duty and are typically cheaper as a result. Your dashcam can rewrite its entire card every few days, and quickly burn through the cycles. I would usually expect a fresh regular card to last somewhere between a few months and a year before files start corrupting. However, mine died in days despite being an unused card, so you can expect failure at any point with these cards.High-endurance cards come rated for exactly this kind of workload. These cards have endurance ratings ranging from tens of thousands to several hundred thousand hours of Full HD recording. These cards also have heat resistance, which is important because your windshield can get very hot in the summer, and writing so much data itself will heat up most dashcams quite a bit.How to know if your card is already failingUsually, a failing SD card will show some warning signs before it dies completely, if you know what to look for. Your dashcam may keep asking you to format the card, and you may not be able to play clips or notice them stuttering or sometimes even missing entirely. You may also see issues that seem like the dashcam itself is faulty, such as recording stopping on its own, or the camera rebooting randomly. If you see any of these from a card that has spent a year or more looping, it's likely dying.Sometimes you get no warning at all. A worn card can keep taking recordings and not really save them properly. In such cases, you tend to find out the worst way, which is when an incident happens, and you're unable to find or open the footage you need.AdvertisementAdvertisementYou also shouldn't count on data recovery to save you. If the card still shows up on a computer, recovery software may be able to grab the clips off it. However, if your card is completely dead, including the controller, like mine was, it won't even show up when you connect it to your PC. It's better to be safe than sorry.What to buy instead of a regular cardThe good news is that buying the right card is easy, as you mostly just want a card with the word "endurance" in its name. These cards have flash memory capable of constant rewriting, and come with recording-hours ratings and warranties that regular cards usually don't get.If your dashcam came with a card in the box, you should check its label before trusting it. Some brands and sellers will bundle proper high-endurance cards, while plenty of them go with generic ones to keep costs down. If the label doesn't say high endurance, you can keep that card for another use.Bigger cards also typically last longer, and not just from the perspective of being able to hold more footage. This is because SD cards spread the writing evenly across all their memory cells, a feature called wear leveling. So twice the cells will mean each one will get written to half as often. You can see this in the ratings too, as the 128GB version of a card will usually be rated for double the recording hours of the 64GB version. A bigger card will also give you more days of footage before the loop overwrites existing clips.Decoding the symbols on the cardA lot of the logos on a microSD card label mostly tell you nothing about endurance, so you shouldn't spend too much time decoding them. The C, U, and V symbols all promise a minimum sustained write speed. Class 10, U1, and V10 all mean 10MB/s, while U3 and V30 mean 30MB/s. If your camera records in 1080p, any of these will be fine, and for 4K you should get a card that is rated U3 or V30.Image credit: Generated with GeminiYou can ignore most of the other symbols when buying an SD card for a dashcam. A1 or A2 is an app-performance rating meant for running smartphone apps, SDHC or SDXC is just the capacity family, the Roman numeral I or II tells you the interface generation, and the big "100MB/s" printed on the front is the peak read speed, which only matters when you're offloading files. None of these measure endurance, so the word on the label and the rated hours on the box are what you should be checking first.The high-endurance dashcam microSD cards I recommendImage credit: SamsungSamsung Pro Endurance: My pick after my own card failureThe Samsung Pro Endurance ($76.99 for 128GB) is the card I bought after my failure and the one I've used since, and it hasn't given me a single problem since I swapped it. Samsung is also a brand I trust when it comes to memory and storage products, from our testing and overall consumer experience.AdvertisementAdvertisementSamsung rates the 32GB version for 17,520 hours of Full HD recording, the 64 GB for 35,040 hours, the 128 GB for 70,080 hours, and the 256 GB for 140,160 hours. The 128GB and 256GB versions come with a five-year warranty and U3 and V30 speed ratings, while the two smaller ones get two and three years of coverage with U1 and V10 ratings. Samsung also rates these cards to keep working from -13°F to 185°F, so a hot windshield shouldn't be an issue. Amazon's listing mixes the speed ratings up between the sizes, so you should check out Samsung's spec sheet for the size you're buying.CHECK PRICE ON AMAZONImage credit: SanDiskSanDisk Max Endurance: The longest warranty of the bunchI've also used the SanDisk Max Endurance ($75.23 for 128GB), which has worked well for me. It's the one I'd point you to if you want a big safety net, since the 128GB version is backed by a 10-year limited warranty, the longest of this bunch.With this one as well, the rating scales with the capacity, as SanDisk rates the 32GB version for 15,000 hours of recording, the 64GB for 30,000 hours, the 128GB for 60,000 hours, and the 256GB for 120,000 hours. You get U3 and V30 speed ratings on the 128GB, so 4K recording isn't a problem, and SanDisk builds these cards to be temperature-proof, waterproof, shockproof, and X-ray-proof under normal usage. The 32GB and 64GB versions are also the cheapest way into a high-endurance card here, at $32.99 and $43.99, if your camera is 1080p-only and you don't need much footage history.CHECK PRICE ON AMAZONImage credit: PNYPNY Pro Elite High Endurance: The most storage for your moneyIf you want more room, the PNY Pro Elite High Endurance comes in a 256GB size ($89.99) that gets you the most recording room for your money of the three. I like PNY as a brand in general and the company makes solid products.AdvertisementAdvertisementPNY rates the 256GB version for up to 68,800 hours of recording. You get U3 and V30 speed ratings, so it can take 4K recording too, plus an A2 rating, which will only matter if the card ever ends up in a phone or tablet. The card is also built to be magnet-proof, shockproof, temperature-proof, and waterproof, and PNY covers it with a two-year warranty, which is shorter than the other two, but this card is also considerably cheaper for the capacity.CHECK PRICE ON AMAZONThe dashcams I'm using in my carsImage credit: 70mai70mai A510: The affordable pick for most carsI have the 70mai A510 installed in my partner's car ($139.99 for the front-and-rear bundle with a 64GB card, on sale for $84.99), and it works great for a pretty affordable dashcam. I've never wished there was a more expensive option in that car, and I think most cars won't need more than this.The front camera records at 2.7K with a 140-degree field of view, and the rear records at Full HD, both of which come out clear. The Sony Starvis 2 sensor captures details like license plate numbers very well in daylight and at night. You also get built-in GPS and an app for downloading clips to your phone, and the camera will lock clips from a collision so the loop doesn't record over them. The 24-hour parking mode needs 70mai's hardwire kit, which is sold separately.CHECK PRICE ON AMAZONImage credit: 70mai70mai 4K T800: The premium pick that records everythingMy premium pick is the 70mai 4K T800 ($409.99, on sale for $359.99), which comes with a 512GB card in the box. I have it in my main car, a new EV that I wanted the best protection for. I hit a wheel on a curb a while back, and the whole thing was documented pretty well, including cabin footage that was excellent for my insurance claim later.AdvertisementAdvertisementIt records the front and rear in 4K using a pair of Sony Starvis 2 sensors, plus the inside of the cabin at 1080p, so I'm covered from every angle, even at night. I get GPS, ADAS alerts, and WiFi 6 for quickly moving clips to your phone, while the parking mode and remote features need a hardwire or 4G kit that is sold separately.CHECK PRICE ON AMAZONHow to keep your current SD card aliveYou can stretch the life of whatever card you run with a bit of monthly maintenance. My general routine is that I take the card out once a month, back up any clips I want to keep, and format it in the camera itself rather than on a computer. Formatting in the camera clears out the file-system clutter that builds up from months of looping, and lets the camera write cleanly again.While you're at it, you should also play back a recent clip to make sure it recorded properly, since that's how you can tell if the card is failing. Heat also tends to age these cards, which is a good reason to park in the shade when you can. None of this will make a card last forever, though. When the format prompts start showing up, you should get a new one, since $60 or so every few years is a low price to pay for footage you may badly need one day.AdvertisementAdvertisementRead More: Back Up Your Phone in Minutes – Best USB-C Flash Drives & SSDsFrequently asked questionsDo home security cameras have SD card failures as well?Your security camera has it worse than a dashcam does. A dashcam only records while you drive. A security camera that records to a microSD card will be writing 24 hours a day, so a regular card tends to die even faster there. The same high-endurance cards are what you want here. You should also check your camera's maximum supported card capacity before buying a big one, since some cameras top out at 128GB or 256GB.What size card should I get for my dashcam?You should get 128GB at minimum, or bigger if your camera supports it. A 128GB card holds roughly 10 to 11 hours of 1080p footage before the loop starts overwriting. Recording in 4K cuts that to around half. Bigger cards also wear less quickly, as I mentioned above, so you get more history and a longer life from the same purchase.Can I use a high-endurance SD card in my phone or a regular camera?You can, and it'll work fine for photos, video, and general storage. If you mainly want a card to run apps on a phone or tablet, an A1- or A2-rated card will load apps faster. If you're generally paranoid about your SD card failing, you can get that extra peace of mind with an endurance card.Can I just buy cheap regular cards and replace them every few months?You shouldn't, because you'd end up spending about the same money while taking on more risk. A basic 128GB card costs $15 to $20, so two or three replacements a year lands right around the price of one high-endurance card that should last for years. The bigger problem is that regular cards fail without much warning, which makes the risk of losing important footage worse.AdvertisementAdvertisementTechlicious and Yahoo may earn commission from links in this article.
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