If you want to shoot video, you already know that CFexpress Type B is the way to go. The spiritual heir of the old CF cards, CFexpress Type B has been making its way into cameras too in the last handful of years. From a performance standpoint, they obliterate the best SDXC cards. Despite this, many if not most of our cameras still use the much smaller and generally cheaper and handier "SD cards" as they're generically called. SD cards are far and away the most popular cards for cameras.
I've been delving more deeply into SD cards since two days ago, and it's a bit like digging in ground that has a lot of buried rocks. (Ever had to do that? It's difficult). Despite which, a few points:
—> Running down corporate history is like tracking genealogy in a small village, and I won't get into the weeds. Suffice to say that SanDisk was indeed acquired by Western Digital in early 2016 and might not be the safe, solid-gold go-to choice it once was for photographers, although it is still one of the main makers of SD-type cards for multi-use purposes.
—> Speaking of which, a little disambiguation:
SD = Secure Digital: up to 2 GB;
SDHC = Secure Digital High Capacity: 2–32 GB;
SDXC = Secure Digital eXtended Capacity: 32+ GB up to 2TB;
There's also SDUC, Secure Digital Ultra Capacity, for storage up to 128GB, but B&H doesn't list one and I'm not sure this standard is relevant.
"SD cards" should really be called "SD-type cards," because "SD" alone has a very specific defined performance parameter, as you can see in this table. I won't change the world, but that's what I'll try to call them herein.
Definition: an SD-type card is any card with a Secure Digital form-factor, including SD, SDHC, SDXC, and the tiny MicroSDXC cards in SD adapters.
As an aside, here's one of those little oddities of history: the SD logo was first developed for an altogether different product, namely, Toshiba's Super Density Disc, an unsuccessful DVD competitor, and that's why the "D" in all the SD logos looks like a disc!
Most "SD" cards you'd buy now are SDXC
The card type names above basically trace the format's evolution. SD, 1999 (introduced by a consortium comprised of SanDisk, Panasonic [Matsushita] and Toshiba); SDHC, 2006; SDXC, 2009. MicroSD (now MicroSDXC) first came out in 2004. Virtually all SD cards you'd buy now are SDXC. Occasionally SDHC, although those seem to be on the way out, for photography at least, although I still have one in my card wallet! Sheesh.
SDXC compared to MicroSDXC. Image courtesy of Kingston.
MicroSDXC cards can be used in adapters that look like SDXC cards, and used as you would use an SDXC card. I have literally no idea whether this is a thing that is done by photographers, whether it works, or whether it's desirable or not. (Oops, shovel hit a boulder there. Anyone out there use a MicroSDXC card with an adapter?) [UPDATE: Robert K. at B&H Photo says (source), "It is not recommended using a memory card adapter in a camera. It can slow the speed of the memory card. And that can produce glitches, especially while shooting video." Despite this, some of our readers say this is what they do.]
They also make it convenient for counterfeiters. Crack a counterfeit big-name card and you might find a MicroSDXC card inside.
I need to write a whole article on counterfeit cards and fake reviews. For now I'll just repeat what I said the other day, which is that it's best to buy your cards from a reliable and reputable vendor. I would not buy cards from a third-party seller on Amazon and I would certainly not buy a card from eBay. No telling what you'd be getting.
—> Keep in mind that the card works in conjunction with the camera. Card types are backwards- and forwards-compatible, limited by whichever one is less capable. Having a card with a newer standard is useless if your camera doesn't support it; similarly, if your camera supports a newer card type and you're using an older card type, you won't be getting the performance your camera is capable of. When in doubt, you can just buy the best card, and it will support the best your camera can do. Knowing what your camera needs, however, is important to maximizing performance while also not spending extra money for no reason. Or, rather, almost no reason: keep in mind that buying a better card than your current camera needs might future-proof your cards for when you eventually get a new camera.
It's also important to realize that if you have a camera with two card slots, and you have a card in each slot, the camera will probably limit performance to the capability of the lesser of the two cards. ByThom says: "Cameras tend to be as slow as the slowest card in them. That applies both to buffer and image review performance. That's why you don't want to put a UHS-II card in one slot and an old, pre-UHS card in the second slot of a two-slot SD camera. Even if you aren't writing to both cards simultaneously, image review performance often will be triggered to the slowest card. Note that some cameras have one 'fast' card slot and one 'slower' card slot. If you use two cards in those cameras, the camera operations are only as fast as the slower slot. ... So: if you want fastest performance use only one fast card in the faster slot."
A similar thing can happen with card readers, too. In a card reader with two SD slots, downloading one card at a time often takes not half the time it takes to download two cards simultaneously, but less than half.
—> Lexar seems to be in a good stretch. Its history is more convoluted than SanDisk's. Originally American, founded 1996, it was at first a division of Cirrus Logic, an IC manufacturer. Lexar was an early leader in USB flash drives. In 2006 it was sold to Micron Technology, and merged with Crucial, another maker of flash memory, and renamed Lexar Media. Eleven years later, in June 2017, Micron (which is a huge company; Lexar was probably on the level of a rounding error) threw in the towel. It announced that Lexar would no longer manufacture portable flash media such as SD cards, and put its Lexar subsidiary up for sale.
Although that seemed like a big deal at the time, it turned out to be a temporary interruption. Lexar was acquired by Longsys, a Chinese company based in Shenzhen, which announced in 2018 that Lexar would re-enter the flash memory market. So Lexar was back. Since then, Longsys has flexed its technological might in several ways, including introducing the first 1 TB card. (Here's a current version. This series, V60 with both write and read speeds on the label, appears to be a strong option for photographers.) Lexar's reputation, quality, and offerings, perhaps reflecting the vagaries of its history, appear to have gone up and down over the past 20 years. Right now things seem to be going well—but I discerned that with a divining rod and my ear to the ground, so don't put overmuch stock in it.
—>Speaking of "V60," I found this nice table sorting out speed ratings:
This is from the website of ProGrade, a newer card brand which I'll talk more about in a minute.
All these speed ratings refer to minimum write speeds. As with the letter designations, speed classes mirror the history and development of the cards. Each type basically supersedes the previous one. "Class 10," the 10 inside the round "C" or broken circle, is not really relevant if the card gives a "U" or UHS speed class (which is different from the I and II, which refer to the bus type); and "V" or video speed class ratings supersede that. So if the card you're buying has a V number on it, you can pretty much disregard any other indication of minimum speed.
As you no doubt already know, the speed rating given on the label of most cards in MB/s (megabytes per second) is the maximum (not minimum) read (not write) speed. As you know I'm forever tilting at the windmills of terminology, but that particular terminology is so asinine it almost makes me angry; as you probably know, MB/s (uppercase B) means megabytes per second and Mb/s (lowercase b) mean megabits per second. (Whoever came up with that bit (or maybe byte) of asininity should be docked 5,000 life points.) The write speed specified for a card means the maximum possible write speed, not a guarantee of what the actual write speed will be.
Some of the more advanced and enlightened card makers are now giving both write (W) and read (R) speeds on the labels of cards. Curiously, ProGrade labels its V90 cards this way but not its V60 ones.
With this card, for example, you're effectively given the range of write speeds right on the label: a guaranteed minimum of 90 MB/s (that V90), and a potential maximum of 250 MB/s. Nice.
—> Another especial area of confusion comes with the UHS speed class versus the UHS bus type. They're not the same. The U with either a 1 or a 3 inside it (see it just to the right of the "v90" on the card above) is a speed-class rating (10 and 30 MB/s respectively) for a camera that uses a UHS bus. The Roman numerals "I" (one) and "II" (two) refer to the bus type, UHS-I or UHS-II, and this is something you should not ignore, because your camera will either be compatible with UHS-II or it won't be and you probably want to get the card that suits (B&H recommends doing so strictly). As you probably know, UHS-I cards have one row of metal pins on the back, and cards with the UHS-II bus have two rows of pins.
UHS stands for "ultra high speed," by the way. And, as is the case with the SDUC card designation noted above, UHS-III has apparently been announced but appears not to exist yet, unless I'm missing something.
—> As I noted on Wednesday, The basic problem of SD cards is that most of them work and most of them serve. And yet there's no one make and model that never has failures and has 100% good reviews. Regarding that, and just in passing, I'll mention that a meme that works for fake reviews is "...and there's one clear winner!" or words to that effect. So every time you see some variant of that sentiment in the title or first paragraph of a purported "review," be suspicious. Human nature makes us want one clear winner. If some antisocial miscreant out there is constructing a clickbait "Best SD Cards" site, that would be one of the tricks he might use.
The sad fact is that there's not one clear winner. And now that the WD acquisition has cast some shade on my old go-to, SanDisk, well, even after all the reading and researching (and desultory websurfing) I've done over the past three days, I still don't know what to buy. And yet, whatever I do buy will probably work and will probably be good enough. Unless of course I just get unlucky.
But now on to the new kids on the block.
—> ProGrade Digital is a private company started in California in 2018 by engineers, marketers and businessmen who used to work for the old Lexar*; some have career experience at SanDisk as well. I've actually written about them before and yet somehow forgot all about them until I started researching cards again on Thursday morning. ProGrade traffics only in higher-level cards, and sells matching card readers. It has an excellent website from which the table above comes. ProGrade also sells recovery, clean formatting, and ingestion software, and has charts on its website for specific camera-to-card recommendations (unfortunately, my camera isn't included... ::sad face emoji::). ProGrade also marks its cards with a symbol meaning the card is compatible with its Refresh Pro software—you can see that in the card image above in the lower right—and some of the cards are marked with both W and R speeds, as I mentioned above. I believe ProGrade cards are manufactured in Taiwan. It's tempting to go with ProGrade just because of the software it offers, among all the other reasons.
Another small, newer bespoke company is Angelbird, from Austria. Its website is also interesting and fun to explore, but unfortunately the "About" page is marketing gobbledegook ("we want to spread our wings and defy the standard industry experience," "we live for adventure," etc.) with little substantive information. But I believe it was founded somewhere within a few years of 2010 and makes its own products in-house, in Austria. There's a factory tour video here that reveals a lot. Angelbird also makes its own card readers too, and although it does not sell software, it does offer a recovery service. And it has a page that matches specific cameras to recommended cards as well. I almost pulled the trigger on a couple of these Angelbird cards last night, but the matching card reader is out of stock.
There's a sharp distinction between anonymous fly-by-night commodity card sellers who are just trying to scrounge a buck, and small bespoke companies who are trying to do everything right and are making solid good-faith efforts to serve discerning buyers. When I first encountered the name "Angelbird" I immediately thought of the former. But they're the latter.
It's worth mentioning out loud that these committed little companies are tending to sell only higher-level, higher-capacity SD-type cards. You can't blame them; they need to make a profit, and they can't beat the enormous multinationals at quick and dirty. ProGrade's lowest-level card is a 128 GB V60 UHS-II card with a maximum write speed of 130 MB/s, for $45 each if you buy a 2-pack; Angelbird's lowest-level card is a 64 GB V30 UHS-I card in its only UHS-I series, maximum write speed 100 MB/s, and that costs $12.99 (and is probably all I myself need, if I'm honest). But apart from that series, all its other cards are UHS-II.
—> Another lesser-known seller, Wise Advanced Co. Ltd. of Taiwan, also has a compatibility chart, and also sells a cool high-performance card reader, which seem to be two indications of a good company to do business with. My Google-fu fails me when it comes to Wise; I have been able to find out almost nothing about them. [UPDATE: They seem to have a pretty strong presence on Instagram.] After I post this tonight I'll probably go read whatever reviews I can find for them at B&H and Amazon. Well, after I check the Derby results. [UPDATE: There were no Wise reviews at B&H or Amazon, and the Derby was thrilling, with a three-way photo finish.]
Here are the charts:
ProGrade Camera Compatibility Chart
Angelbird Technologies Camera Compatibility Chart
Wise Advanced Co. Camera Compatibility Chart
Compatibility advice might also come from your camera's manufacturer. Here, for instance, is the compatibility page for Fuji cameras. Sigma (I shoot with a Sigma fp, converted to monochrome by Daniel Morrison of Monochromeimaging.com) has a page of recommendations of various media, which I perused for commonalities; basically it recommends only V90 cards with the UHS-II bus. But of course there's a wrinkle there, because the Sigma fp is made as a video-centric camera and I use it exclusively for stills. So does that mean I'll see any performance increase if I use a V90 card for stills? I admit ignorance.
I must say I like this emerging custom, however. I mean the compatibility charts and the focus on...well, us. In the past three days I've found that SD-type card choice is pretty simple on the surface, but more and more opaque and mystifying the deeper you try to delve into it. Will the camera compatibility chart become the signal that a company is worth our attention? Could happen. I particularly like the way ProGrade splits its charts into Camera (i.e., stills), action-cam, and video sections. That makes a lot of sense. I also appreciate that Angelbird differentiates between media that is merely compatible and media that it recommends for any given camera (they are constantly making actual in-camera tests, according to the video linked above). I like that. I want my media recommended, please! :-)
The ideal SD-type card compatibility chart would specify the usage, at minimum stills versus video; would differentiate between "compatible" (i.e., works) and "recommended"; and would be backed by actual in-house, in-camera tests like Angelbird performs.
It's nice that smaller companies such as ProGrade and Angelbird are cropping up that appear to be specifically catering to photographers and videographers who use higher-end digital DSLR and mirrorless cameras. I don't know how good that will be for them, but it's good for us.
ProGrade, Angelbird and Wise are all available from B&H Photo, which I trust as a vendor. I've linked to vaguely middle-of-the-range options, and you can explore from there.
Mike
A big thanks to all my Patreon supporters, new and old, who help keep the lights on.
*In Kawasaki City, Kanagawa Prefecture, Nextorage was similarly founded by a number of ex-Sony engineers and staff with long-term experience in flash memory products. Like Wise Advanced, Nextorage appears to serve the Asian market and is little-known here.
Original contents copyright 2024 by Michael C. Johnston and/or the bylined author. All Rights Reserved. Links in this post may be to our affiliates; sales through affiliate links may benefit this site. As an Amazon Associate I earn from qualifying purchases. (To see all the comments, click on the "Comments" link below or on the title of this post.)
Featured Comments from:
Ken Bennett: "I've been using ProGrade since they came out, both SD and CF Express, and they've performed very well. The card readers are excellent. Not cheap, but nothing is in this business. :-) "
Kye Wood: "Timely question you asked there. Yes. As of last month, I've been using a Samsung EVO MicroSD card (512 GB) in the SD adapter that they come packaged with. It's inside an OM System TG-7. It's brutally fast and I can't fault it. Given how much cheaper the MicroSD cards are than the same sized SD card, it seems like an idea I'll employ in more cameras."
robert e: "Have you looked into Kingston Technology? I used to think that they were a value-added assembler, but turns out they're a privately held US-based chip maker founded in 1987. Impressive Wikipedia history. Anyway, they're never the cheapest choice, but never the priciest either. Ubiquitous, with an excellent reputation (as far as I can tell). My choice when I can spend a few bucks more for peace of mind, especially since SanDisk started slipping."
Peter Williams: "I've been using the Samsung EVO series microSD cards in adapters for years in my Fuji X-E3 and Kingston card reader. Never had any issues and they are better value and more readily available than regular SD cards."
Greg: "I recently got an OM-1. Based on discussions on DPReview and elsewhere I determined that for stills, V60 was all that is useful. Since V90 cost a lot more, it was worth knowing. And the only limitation on a V30 is probably the speed and number of burst shots. At at guess, that doesn't matter to you. For my camera, V90 will provide benefits for video. I haven't bought a card yet—still using existing V30, so your post will be helpful. I second the comment on MicroSD being too small."
Stephen S.: "Robert K. at B&H Photo is incorrect. You can easily find dozens of photos online of MicroSD to SD-type adapters that have been cracked open, and they very clearly just match the pins from one format up to the other. There is no circuitry or intelligence of any kind, so there is no way the adapter could slow the MicroSD card down compared to using it on its own. Sure, some MicroSD-type cards may simply be slower than some SD-type cards, but an adapter won't slow them down."
"'I would not buy cards from a third-party seller on Amazon' is good advice, but better is to not buy from Amazon at all. Even cards 'shipped and sold by Amazon' can be counterfeit cards mixed into their own inventory by nefarious third parties, thanks to the joys of 'co-mingled inventory.' If you're not familiar with that practice, it's worth Googling."
Bob G.: "Thanks for the research and reviews, Mike. Always worth the effort to try to clarify, even if it’s a work in progress. Every time I try to do a deep dive into these memory issues, it becomes too much to ingest, and I just go with the manufacturer’s recommendations, which get dated fast. Overall, I’ve shied away from the micro SD's in still cameras, and just use them for the GoPros or car cams, etc. Their small size seems to beg issues to create more problems, handling, heat, dirt, etc."
Kenneth Tanaka: "Don't look now, but this whole topic might be becoming quaint. Right now I have two cameras that have large, lightning-fast internal SSDs for storage. My Leica M11P has a 256 GB internal SSD and my Hasselblad X2D 100c has a 1 TB SSD. The general consensus seems to be that many other upper- and mid-range cameras will soon follow suit. It's likely that most cameras will continue to offer removable storage options for some years. But with most top cameras now emphasizing connectivity and rapid communications for image files, and with many brands beginning to offer phone app utilities (i.e. marketing-driven apps), I don't see removable media on an incline for digital photography."
JOHN B GILLOOLY: "This may have been mentioned somewhere in the comments but I did not see it in my quick pass. I am a bit of an intensive user of these SD cards. For example, my image count from April (last month) was 27,842. I've used various brands—typically Sandisk and Lexar. For SD cards, this started back with maybe 16 GB cards and I now have four 128 GB in my main rotation with a couple of older 128 GB sitting in the bag for backup.
"But the weak-point of SD cards is the very fragile plastic 'guides' that run along the bottom of the card between the gold/copper contacts. If you damage these flimsy little pieces, the card becomes unmountable, which is a huge issue. For that reason I have moved to only using Sony Tough cards as they do not have these pieces of plastic. The Tough cards feel different and sound different—feel solid and sound more ceramic? They seem more expensive, but they do not have this weakness. Has anyone else considered this factor?"
Ed. note: If you want to hear what John means by "feel different and sound different—feel solid and sound more ceramic," check out the beginning of this short promo video by Delkin for the Delkin Black cards. Although it might be computer generated, it perhaps represents what John means.
KeithB: "As an 'Illuminary' on the Canon Community board, our standard advice has been that adapted micro cards can cause issues with Canon cameras. Based on anecdotes, there have been a lot of folks who have card trouble with micro cards, switch them for full size cards, and no longer have trouble. So for Canons, at least, stick with full size."