Terra Galleria Photography

Lessons From Losing a Week of Photos to Memory Card Failure


Summary: One of the photographer’s greatest fears is to lose a significant chunk of images from a big trip or event. In this long-form article, find out how a memory card failure caused a week of photographs to disappear, what I did to try to recover them via software, then physical data services, and the valuable lessons, counter to common knowledge, to be learned about memory cards, dual card slots, and backups to prevent such a nightmare scenario from happening to you.

Landscape expeditions can be taxing in the long days of summer, even more so if you are also doing night photography. After flying to Seattle, I arrived at the coast of Olympic National Park around 11 PM – many view Treasured Lands as a culmination of my work in the national parks, but I am far from being done with them! Seeking stars, I woke up before 2 AM for the short window between moonset and astronomical twilight. However, the marine layer had rolled in while I was hiking to the beach, and I shivered until past sunrise time without even seeing a sliver of sky. The next day, since I had to drive from Heart of the Hills Campground and hike 45 minutes to Hurricane Hill, I rose before 1 AM.

On the last day, temperatures in the inland plains of Hanford Reach rose above 100F. When I came home from the week-long trip, I went straight to bed. The next morning, I reached for my cameras, took the memory card out, and inserted into the card reader. This resulted in the dreaded:

Attempting to read the card with software

I reacted with mere annoyance at the computer, and tried to read the card from the built-in memory card slot of a laptop. The same message appeared. Growing worried, I inserted the card into a standalone backup device, and it said “Memory card not found”. Surely I would be able to see the files in the camera, since the last time it had been turned on, less than a day before, everything was normal and I was able to scroll through some images? Nope, like the computer, the camera said “Unable to use memory card. Format?”

The PhotoRescue software installed on my computer had been successful at rescuing files from a corrupted card in the past, however, it did not uncover a single file this time. Hoping for better luck with Lexar’s own Image Rescue software that came with the card, without the activation code handy, I contacted Lexar’s customer support. They were quick in providing me a download, but it did not help:

Note that the computer sees 8.2 GB, but it was a 64 GB card. Lexar support suggested several other apps, including Ontrack® EasyRecovery which has a “technician” version with a $500/year licensing cost. As those apps include a trial mode that allow you to attempt to discover files, and require you to pay the fee only to actually recover them, I took each of them for a spin without success. There are a lot of recovery programs around, but if the error is hardware rather than software, you can try all the programs in the world, and they won’t do you any good.

Dealing with physical data recoveries services

It was time to contact a physical data recovery company. All those companies have a similar mode of operation. You send them your media with pre-paid overnight shipping at their cost, they diagnose it and provide an estimate. If you approve the estimate, they attempt to recover files and charge you if the recovery is successful. Seems fair, right? The problem was that the quote from the Lexar-recommended company was quite a bit higher than I expected:

After a bit of shopping, I found another company which provided me a lower quote. I sent them the card via Fedex overnight and got the following diagnosis:

Despite numerous attempts to identify the source of the problem, we were unsuccessful in reaching a solution. At this stage it is clear that this is an extremely complex case that will require extensive research, time & use of in-house donor parts. Your media will be passed to our Research and Development department; They will be able to research & execute techniques such as safe removal, reballing and replacement of the core processor and other components containing device specific information and repairs to fractures in the tracks of the logic board.

The work we would attempt is a highly skilled process that is not infallible. The chance of a successful recovery once these processes are completed is approximately 74%. At this point most Data Recovery services would send the media back to you as they don’t have the ability to do such complex work, let alone any sort of R&D department. Our R&D department is one of the best in the world, and they are responsible for creating new techniques and ways of recovering data that allow us to sustain an overall 92% recovery rate. Currently, we have two options for you:

Option 1. You allow our R&D department to use the lab time, parts & cleanroom facilities needed to gain access to your data. This is a standard process that will be completed within 15-20 business days. To go ahead with Option 1 an upfront payment of $800.00 is required, and this covers everything the R&D department will need to provide you with feedback: all lab time, parts required from our library, and cleanroom usage. If we are unable to gain access to any of your data that initial fee is not refundable.

Option 2. We return your media to you via either our courier or standard option, and you incur no recovery costs as we were unable to recover your data.

Although the fee wasn’t too bad, I wasn’t going to pay upfront without a recovery guarantee, especially after my friend Tommy, a technology entrepreneur and all-around geek opined “These are extremely difficult and risky techniques. I’m skeptical that they have such capability and even if they do, I doubt that the success rate is 74%. I guess more like 25% or less”. I declined, received my media back a few weeks later via regular mail, and sent it to yet another data recovery company:

Would you have proceeded with the recovery at this price?

Although you don’t often read that in reviews, my main complaint with the Sony A7R2 cameras is sensor dust resulting from the mirrorless design and an ineffective sensor dust cleaning system – it mechanically shakes the sensor using the image stabilization actuators. To cope, I work with two camera bodies in order to minimize lens changes. The excellent 24-105 FE (review) stays on the primary camera which is used for most of the photographs, while I reach for the secondary camera when I need more specialized lenses. On that trip, I had failed to do drive backups and the damaged memory card was in the primary camera, which meant that it contained the majority of a week’s worth of work, and probably the best photographs. However, I retained usable images from the second camera, a few of which illustrate this post.

I decided against proceeding with the attempted recovery, saving me the potential disappointment of failure or costs. It is not that the pictures aren’t worth the amount asked. Rather, including all expenses, the trip cost me only a fraction of that amount. This math didn’t account for my time, but no matter how tiring the effort felt, that time was spent on a process that I largely enjoy. Losing the pictures did not rob me of the experiences I had nor of the scouting I did, and rather than looking back by investing in the recovery, I chose to look forward by saving the money for a repeat trip – and a new camera.

The larger conclusion here is that attempts to read a card with recovery software may not always work, physical recovery services are expensive, and also not guaranteed to work. Even after three decades in photography, the incident reinforced several lessons for me.

Memory cards can fail

The disaster drew home the point that memory cards do fail catastrophically. Both data companies found serious physical damage, but that was a card that had been moderately used for a year without any single glitch, so neither “dead on arrival” nor past any reasonable life expectancy – which by the way nowadays is longer than technological obsolescence. It had never been subjected to any form of abuse before as it spent most of its life in a single camera, was formatted after each download, and prior to failure went straight from the camera to a card reader. There were certainly no warnings nor reasonable explanations.

I have been using digital cameras since the first days of full-frame in the early 2000s (remember the $8,000 Canon 1Ds series?) without any card failure, while during that time, I have had to replace a half-dozen failed hard drives. This made me overconfident in flash technology.

If you browse the internet, you will see that I was far from being alone. Quite a few other professional photographers (some with scores of workshop clients) state that they have never experienced any card failure and that when it happened, they were always able to rescue images with recovery software. Clearly, my experience has been different. The fact that you’ve been lucky doesn’t mean that your luck won’t run out at some point, as it did for me – and others. As we will see next, a quick perusal of customer reviews shows that memory card failure is not that rare.

Cards are not equally reliable

The card that failed is a Lexar Professional 1000x 64GB SDXC UHS-II/U3, which is amongst Lexar’s top line of cards, and deemed “professional” by the manufacturer. I used to believe that any memory card from a reputable brand would be reliable. If in addition, you bought it from a reputable vendor, chances that you’d get a counterfeit of questionable reliability would also be low. The preferred vendors are specialist stores such as B&H, but Amazon is fine, as long as you don’t buy from their third-party merchants. Sandisk and Lexar are two of the most well-known brands, and I’ve used exclusively their cards, depending on the best deal I could find at the moment.

Because of that belief, I didn’t pay much attention to customer reviews, adopting the attitude that nothing is 100% foolproof and unlucky folks can have a bad experience with any product. Besides, a quick glance at the ratings show that almost all cards are rated between 4-stars and 4.5-stars, so they must be good products, right?

It would have done me more good to read the Amazon customer reviews before buying the card, but after the card failure, I looked them up. One of the first 1-star reviews I read described the exact same experience I had:

I literally had just reviewed the pics on my Nikon D610 camera and inserted the card into my card reader and got a message that it was not formatted (which it was – I format every card when it’s new). I put the card back into my camera – and same Format error.
Although I didn’t read all the 300 1-star reviews, the ones that I sampled overwhelmingly bemoaned card failure. Since this was becoming quite relevant, I looked at the 1-star review tally: 15%. That’s almost 1 out of 6 reviews, odds similar to the Russian Roulette. If someone killed themselves playing the game, I don’t think you’d attribute his death to “just bad luck”. Of course, this is not a scientific observation because several factors affect review-writing, but you get the idea. On the other hand, it is instructive to compare the percentage of 1-star reviews for a few other UHS-II cards: If we assume that 1-star reviews are exactly the type you’d leave if the card totally failed, from that small sample, we can see that some cards are four times more likely to fail than others. This data also sugggests that there is a problem with those UHS-II Lexar cards. On the other hand, the Lexar UHS-I card that I have used for several years gets a convincingly low 3% of 1-star reviews. The lesson here is that not all cards are equal, even amongst those from a top brand. And if they can have such a high failure rate, think about cards from less reputable or conterfeit brands! By the way, looking at those numbers also indicate that failure rate with SD cards is far higher than CF cards.

Pay attention to negative customer reviews

Some negative customer reviews are frivolous because they are rooted in user error, or because they concern themselves with delivery rather than the product’s quality or performance. However, negative reviews are generally more significant than positive reviews.

If you think that one shouldn’t focus on the negative while the vast majority of reviews are positive, consider that on Amazon, the average rating for a product is 4.4 (out of 5) as found here by analyzing 7 million reviews. Even a product with an average 4.0 rating (4-star) is below average. The large majority of products are rated above 4.0, so the difference between a great product and a subpar product is less than 1 (star) on average. On the other hand, we’ve just seen that the number of 1-star reviews for different cards varies by a factor of four.

Consider dual card slot for backup

If your camera has dual memory slots, the most obvious and foolproof way to prevent data loss from memory card failure is to set the camera to write to two cards simultaneously so that it creates a back up in real time. Now that memory card have become very affordable, you can buy two sets of cards with enough capacity to last you for your whole trip so you don’t have to reuse any card, and you always keep two datasets.

Dual memory card slots are standard in high-end DSLRs cameras, and after omitting them in their first two generations of mirrorless cameras, Sony has started providing them in the A9 and A7 mk3 series (a good example of listening to customers, since there were complaints about the single-slots in previous cameras, many of them from Canon and Nikon users), with the caveat that the second slot is UHS-I, so using simultaneous writing will negate the benefits of the faster UHS-II main slot. I was thinking of skipping the A7R3 generation and wait for the inevitable A7R4, but the incident prompted me to upgrade.

Recently announced full-frame mirrorless cameras from Canon and Nikon have been greeted with an inordinate number of Internet comments about their single memory card slot. We saw many claims that no professional would use cameras with a single memory slot.

But the fact is that some professional photographers refuse to use the second slot for back up even when their camera has one, and for specific reasons. To start with, when I was shooting the Canon 1Ds series, I did not set up the cameras to simultaneous write, possibly because the size of the memory cards available back then made it mandatory to perform daily backups. More recently, Lloyd Chambers uses his dual-slot Nikon as single slot SD cameras because he is annoyed by the camera defaulting to the wrong card – this reminds me of Ted Orland’s aphorism “Owning more than one lens assures that you will always have the wrong lens on the camera for any given picture” – while Thom Hogan uses his dual slot Nikon as a single slot XQD camera because the SD slot slows down the camera. Colby Brown thinks that “there is no point in making two copies of your SD cards” and accordingly sets his Sony A7R3 to auto switch as he estimates he has a higher chance of missing a shot because of a full card than a SD card failure – what I used to do with the 1Ds.

I wonder if those statements about the rarity of card failures do a disservice to less experienced folks, because what isn’t clearly disclosed is that, although those photographers apparently don’t fear card failure, they also have extensive backup strategies using hard drives.

Have a solid backup strategy

If there is one thing that I wish others learn from my misfortune, it is that a solid backup plan is necessary. You want multiple copies of your data in multiple places. There are quite a few ways to go about it.

Several brands now offer ruggedized portable drives. SSDs, which have fallen in price, are much less prone to damage than HDDs. Using drives for backups, you can do a daily (or even more frequent) backup, and have more than two copies of your data.

On the other hand, compared to the in-camera dual slots backups, drive backups are not in real-time, so you could possibly lose a day of data. More importantly, you need to remember and take the time to perform the backups – when maybe you’d just rather go to sleep. During that ill-fated trip, I carried a portable drive, yet due to a combination of fatigue, loaded schedule and complacency, I did not use it. Another reason was that my portable drive had experienced a glitch during the previous trip, forcing me to skip backups, which in turn broke my habit of making them regularly. This brings up the point that with drive-based backups, you have to carry more gear, which could also fail. Even if you carry several USB external drives, you still depend on your laptop for your ability to make drive backups.

With in-camera dual-slot backups, given the availability of huge capacity cards, you could shoot most trips on a single pair of cards, but if something catastrophic happened to your camera, you’d lose everything. Alternatively, you could use smaller cards, and once a pair of card is filled-up (or another threshold in capacity or time is reached), each of them can be stored at an independent location to minimize the risk of loss due to theft. While the second approach increases the chances of a problem because you have more cards to manage, it minimizes the adverse effects of problems.

For now, I have settled on an approach which I think provides me the most redundancy with the least effort: use the second slot of the A7R3 for real-time backup with a medium-sized card, plus do a daily backup on a single self-contained portable hard drive. My choice is the HyperDrive ColorSpace UDMA3 that I fit with a SSD drive. I generally prefer such a device to a laptop because they are considerably smaller and much faster to deploy for backup.

Eventually, my data loss was caused by my own neglect. I let my guard down and did only a few trips without backing up, and see what happened. This is just my experience and one data point, but I hope it’s been useful to you to read about it. What is your backup strategy? Did you experience a catastrophic memory card failure that you’d like to share?


  1. jim says:

    my process is simple, change memory cards at least once a day, more frequently if I know I have already captured multiple images I’m very pleased with or taken under very unique circumstances. Cards are cheap, in the “Old Days” the most you had at risk from a shoot was 36 (35mm) or twelve(120) or two( sheet film)now the idea of putting 100’s at risk makes no sense to me.

    • QT Luong says:

      Thank you for commenting. In the “old days”, the risk came also when you had to send the film to the lab, at least for those who worked in color. You had to choice of sending all your trip’s film in a single package, or in multiple packages, which is similar to large cards versus small cards.

  2. Bill McMannis says:

    As a more than decade old habit, I move all photos off of the card after each day’s shooting, then perform a low level format. If the card is beginning to fail, I catch it while formatting.

  3. Richard Wong says:

    Sorry to hear about your experience, QT. Thanks for sharing your findings though – I’ll consider getting a new backup HD for travel. I have an old one that is too slow at this point.

  4. Kevin Ebi says:

    I’m so sorry that happened to you. I used Lexar cards almost exclusively until this summer. A relatively new CFast card scrambled about one out of every 10 images. I camped, so I didn’t have my laptop and backup drives with me and therefore I didn’t discover the problem until I got back home. And it happened during one of the most incredible days of wildlife photography I’ve ever had. Luckily, the best images of a key sequence were fine. What can I do to prevent that in the future? I could shoot to two cards, but that would slow my camera. That’s not an issue for my landscapes, but it is for wildlife. For me, I’ve made peace with the fact that going digital has some risk (although I once lost a roll of slide film). In my experience, it’s been a very small risk. In 15 years, I’ve lost images twice. Once was a card failure. The other was my stupidity. I thought I copied a card to a drive when I hadn’t – and I discovered that mistake weeks later after the card had been filled several times. I do like your advice, though, about carefully considering reviews; my new CFast cards are made by Sony.

  5. Hi QT, sorry you had to write this article. I do appreciate this article tho. I shoot with a few different cameras, but the camera I shoot with the most is my X-Pro2. I have utilized the 2 card slots (2nd for back-up) since the first day I have shot with it. I have never experienced any card problems, but now I am concerned since the two cards I use in the X-Pro 2 are Lexar 1000x UHS-II models. Personally I would not purchase a new camera without dual card slots. Thank you again for this very informative article.

  6. Oliver Klink says:

    A few years ago, I remember one of my customers had bought inexpensive Kingston CF cards at Fry’s Electronic for his Hasselblad H4-50. This was the first time I heard about memory card failure and obviously blamed it on the brand.
    I also shoot the Sony A7RII and the A9 and I can’t count how many times I have seen the message Database corrupted, do you want to fix it, press YES. The first time I was skeptical and as there was no other option, I pressed YES. Luckily, DB was rebuilt and no losses. From this experience, I try to change my batteries before they are totally dead. Also, I purchase the fastest cards (300mb/s) to avoid a buffer overflow.
    I also learned that all memory card readers are not equal. One retired Lexar manager had a webcast mentioning that card readers can damage your memory cards. So, I stay away from the inexpensive readers. Have had no problems with the Lexar USB 3.0 Duo Slot reader.
    When I copy my memory cards to my hard drive, I use ChronoSync vs. copy/paste or LR download. The software has more fail-safe features (also use to backup my drives, etc.). And I label my drives with the date of purchase so I can rotate them after 2 to 3 years.
    All that said, I did lose data one time because of putting off the purchase of higher density drives for my RAID system. I manage over 100TB at my studio and was running out of space in one of my RAIDs. I backed up the data on drives that were out of my typical workflow vs. purchasing new drives. BAD mistake as I got hit by the perfect storm: when I was on a call with a tech support who told me to upgrade something, I pressed reformat drive on the wrong RAID system (thinking that my data were backed up somewhere else) Lost 40,000 images, which I was able to recover from a 3rd party service ($3,000).
    The big lesson that I learned is it is much cheaper to purchase additional drives (or higher density drives) vs. breaking your workflow.
    The never-ending story of data management 🙁

    • QT Luong says:

      Thank you for those interesting details. Yes, I also saw that Database corrupted message quite a few times. That’s an interesting possibility that the card reader might have damaged the card, since the appeared to be working fine before being inserted. On the other hand, why on that particular instance, whereas it has worked OK before and after the incident?

  7. Barbara Folger says:

    Does anyone use PhotoMechanic to back up after a days shoot?

  8. Derrick says:

    Super interesting article. Thanks for sharing your experience. I’m just a hobbyist but recently made a once in a lifetime trip. I must admit that I didn’t use the second slot on my camera but what I did do was backup at the end of each day, onto my 512GB ipad pro. I would also spend a bit of time in the evening culling photos in Lightroom CC, reducing the space requirements of this process and saving me future editing time.

  9. David Lobato says:

    Did you try re-formatting the card in the camera? Then try the recovery software? The flash memory cells might still be holding the data. The software can recover files that are re-addressed as open for re-writing. I did exactly this several years ago with a failed card and recovered the files.

    • QT Luong says:

      Thanks for the suggestion (which sounds counterintuive). Yes, I’d seen suggestions of reformating card before trying to recover but formatting fails both in MacOS and with the camera, it looks like because only a portion of the card is physically accessible.

  10. Brian Wiese says:

    So sorry to hear of the great loss QT! I hear stories like this and want to think “don’t trust Lexar” — but that’s not it. I have Several SanDisk SD cards that have failed me that are suddenly “not readable” as well! So the fact of the matter is, “don’t trust media cards” in general – or hard drives – make backups/copies – as you said! Sadly a new 64GB card costs less than $20 these days and generally holds several days of photos (perhaps not video though) so I also only tend to download “when the card is full” — but that may be too late!

  11. Data get corrupted due to many reasons and but many people have no idea to recover it back again. In this article, some useful information is very nicely explained.

  12. You easily recover deleted photos from your memory card with the software but if you do late then you might not able to find the photos.

  13. Luke Lang says:

    Hi QT, I no longer eject my memory cards to copy the images. The idea is to eliminate handling of the cards. I just connect a USB cable to the camera to copy the images. Based on your description of being able to view the images in-camera, the damage probably occurred after ejecting the card. You probably could have gotten your images if you didn’t eject the card and just copied via USB. After copying and backing up, I format the card in camera. I also copy the images nightly.

    You have been quite an inspiration. Hopefully, I’m able to contribute something useful to you.

    • QT Luong says:

      Thanks Luke, your procedure makes sense if the camera USB connection is fast and solid enough. A potential downside would be to wear out the camera USB connector. In my experience, on the Sony A7R2, it was quite finicky being micro-USB. For instance, the connection with my USB intervalometer was never secure, causing quite a few sequences to be interrupted prematurely.

  14. albertjh says:

    In my case, Once the memory card failure, I try to formatted it. Once the memory card formatted properly I used a data recovery software such as Stellar Photo Recovery which help me to recover deleted photos from memory card. Thanks!

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