I am slightly confused why they use UHS-I instead of UHS-II (or even UHS-III) for such a big capacity. Seems like people needing so much capacity probably write a lot of data in a short time. UHS-II is 3 times quicker.
Then again maybe they are aiming for devices that can’t even run UHS-II
Could be a trade-off issue. They can get capacity or speed but not both yet.
Or it’s cost-prohibitive ATM. As in, they could get both, but you’d pay a ton for it.
I can imagine this being useful for cases where you write a lot of data over a longer time period. Think CCTV (with low-medium resolution). You can keep a sizeable archive locally and never have to swap cards
I assume larger capacity means longer endurance, too, since you’re not constantly rewriting the same cells.
It’s SanDisk, I expect the opposite - that every cell increases the volatility and chance of catastrophic failure.
Oh yeah cctv could be a good option indeed.
At this size you could carry your backup with you all the time or store it in your car encrypted.
They’re slow as all hell, which is more pronounced the larger these are in capacity.
You’re best of getting a tiny m.2 enclosure for something like that.
This is the kind of discussion i’m here for. Thanks everyone! I didn’t know SD and micro SD cards where this unreliable but i always use them for short term stuff or content that is backed up somewhere else so i think i’m good.
They aren’t that unreliable FWIW. Obviously, it should not be your only copy of media, but I have microSD cards that are still readable with data intact even 10, 11, or more years later.
If you buy quality microSD cards, expect them to last a long time.
I feel it’s worth mentioning the application of them also factors into their longevity.
Good quality SD card holding some documents and random files? Yeah probably 10+ years. Good quality SD card being used in a dashcam, constant writes? I’m replacing my good SD card after about ~2 years of service because its showing signs of failure.
I feel it’s worth mentioning the application of them also factors into their longevity.
Good quality SD card holding some documents and random files? Yeah probably 10+ years. Good quality SD card being used in a dashcam, constant writes? I’m replacing my good SD card after about ~2 years of service because its showing signs of failure.
True. It’s all about the application.
All I want is higher resiliency SD cards. It must be a technology limitation with being unable to fit a good controller in there or something because I would gladly sacrifice speed and capacity for something reliable in a lot of my applications.
I mean, it exists, but it’s experimental and extremely expensive
What SD cards are you buying, and where are you using them?
I’ve been using a 256gb Sandisk high endurance SD card in my dashcam since 2021 (when I lost the first 2 I’d bought in 2018) and it’s still perfectly content writing a 4k + 1080p video for about 16 hours straight every single day. It wasn’t until last year I got a 512gb Samsung Pro Plus drive to split the load/act as a backup.
Didn’t we only just start getting 2TB microSD?
Just need to set them up in a raid configuration for redundancy.
Redunda-what?
The only RAID is Zero.
Gotta go fast
I feel like this is a product looking for a market. Why would anyone ever trust that much data to something so fragile and easy to lose?
I’d love them for my dash cam if they were affordable. My camera records in front and behind of my van in 4k, so that’s 90-100 gigs an hour. I leave it running as a surveillance camera when I’m parked, so just going to work and back in one day would use over a terabyte.
Why would you continuously record? Just record motion events and you won’t need a card that large at all, plus it will last a lot longer.
Busy parking lots always have motion.
They’re not for long term storage, they’re for transient storage like photography, in particular stuff like surveillance cameras
if you want long term CCTV setup properly you should be using ethernet connected security cameras and then transmitting it back to a central server with a hdd always recording. It’s much more reliable and way more cost effective, just requires you running an ethernet cable to where the camera is.
It depends on the type of location, small remote locations might not even get their own local network
Yeah but the live feed and remote downloading sucks
with ethernet the live feed is perfectly fine, and there is no remote downloading, it’s all streamed over the ethernet to a central box which handles everything from there. You might need some decode/encode capabilities, but to my understanding a lot of cameras will run multiple hardware encodes straight from the sensor over to the network already. So you probably don’t need much.
What brand do you have?
Filming 8K in a raw format maybe?
Also useful for devices where you want more storage but the device only has an SD card slot, or other slots are already occupied or sd card is just easier such as phones, Nintendo switch, steam deck, ultra light laptops, raspberry pi…
It’s only 104 MB/s. Not enough for RAW video.
Also could be handy for smuggling banned movies/tv shows into authoritarian countries that block or outlaw unauthorised VPNs?
Though for the price these will retail for, would probably be easier to take more, smaller capacity cards…
4k Drones, upgradeable phones, DLSR cameras, Data per weight etc.
I own a 1tb ssd for my Steam Deck, literally 0 complaints, runs real fast, can’t feel any heat, never need to take it out other than if I’m factory resetting, it’s perfect! (though Valves next deck should just have a bigger ssd slot)
I use a 2tb (iirc) in my steam deck. Perfect application for that… Low rewrites, but totally expendable/replaceable data.
When I started my career I used to have to manage tape backups for the company I worked for using LTO tapes that stored a huge 100 GB lol
Awesome,
but I wonder if we’ll ever get better read and write counts on SD cards. It feels like the size is getting larger than the amount of possible writes to the device, making it kind of moot.
SDUC supports up to one hundred and twenty eight Terabytes O.o
Who in the world requires so much Storage on a tiny SD card?!

“I’ve said some stupid things and some wrong things, but not that." – an actual Bill Gates quote referring to the 640k quote that won’t die.
But yes, it was probably satirically ascribed to him because of MS-DOS not having the capability to deal with any more than that amount of RAM for a lot longer than it probably should have.
The “temporary” solution of requiring an extra driver to be able to do so (EMM386.SYS or similar) remained in place right up until DOS-based Windows was allowed to die.
(The underlying reason was almost certainly ancient IBM PC memory-mapped IO standards, so maybe we could ascribe the original quote an engineer working there some time around 1980.)

We say that about every tech capacity. No way anyone could ever use more than 1.44mb, oh man 2mb ram will be all I ever need etc.
People who want a Raspberry Pi NAS without having to buy a hat?
I wish I could trust SD cards enough to use one on my Pi NAS… I just snagged a 5GB external HDD.
Five… gigs?
Oooo thank you. Brain broken today. Five gigs is the average movie size hahaha
Pathetic.
Isn’t it preferable to have a RAID configuration for your NAS? Or do you then buy multiples of those and requiring again a hat or external card readers.
Certainly, but only if you’re proactive about backups. If you’re lazy, well…
node_modulesSteamdeck game library
Luckily there is a m.2 slot in the deck 😉
And in general as well, does it make more sense to use m.2 Type-2230 SSD instead of SD cards, these days. Way faster and way more robust.
As someone who did swap theor steam deck’s M.2, I really wish it were a 2280 instead since those drives can hold much more. The largest 2230 I could find was only 2 TB.
Not really super feasible for the average user to crack apart the plastic casing and reformat the new m.2 slot (since there is only one) with a new SteamOS partition.
I think you’ll find 95% of all steam deck users will prefer popping in a microsd than ripping apart their deck and formatting/transferring in a new internal drive.
It’s not too hard. Make a direct copy of the old drive to an external drive. Install the new drive. Do a direct copy back onto the new drive from the external. Expand the partition to the new size.
Or you can install the new drive and reinstall steam os.
For you and me no it’s not too hard at all. But you and I aren’t the average consumer. The average consumer buys it and uses it like a console. To the average consumer, this is impossible. Very few people are going to open it up and conduct what they would consider computer surgery.

I don’t get it
When people disassemble their steam deck for the first time, they often forget to pull out their expensive micro sd, and it gets cracked by Steam deck body in half
Oof. Thank you for explaining.
Deck gang rise up
That’s a lot of games/applications then, is the card reader fast enough though?
How many different game are you trying to play at a time?
I use mine exclusively for emulation and ROMs, entire libraries of every single game released for older systems. The SD card I have for that runs them fine without issue. Potentially with newer/bigger games you might come across issues, that I haven’t really done at all.
I’ve been using a 1tb sd card with mine and my steam library. Not any noticeable difference in speed between the internal ssd and micro sd.

I want all my music on my phone, not just a pithy 80,000 songs.
As a bandcamp flac lover, I concur. I’ve spent so much supporting small artists it’s actually insane. I make two copies after I download an album: one to giant memory stick which I can plug into entertainment systems and such, one to the microsd in my phone. I currently have 1TB microsd in my phone for this reason, but I can see it possibly running out one day :D
using less space for your storage is always better
Look, some people may have a porn collection that they need to backup and store “about their person” and this is the ideal way to do that.
Don’t be kink shaming.
Def means my next phone I’m buying I make sure has a micro SD slot…
I love emulation on my phone as a hobby and his is hitting the sweet spot where by the time I need to upgrade again in a few years everything up through PS2 generation should be full speed even on mid tier phones that typically still offer micro SD
And 8 tb of micro SD is enough space to carry literally entire romsets for every system I like besides PS2/GameCube which is fine.
The micro SD is 4 TB. Only the full sized SD is 8.
Yeah but in 2-3 years I’m sure they will have an 8 tb micro SD out
What would anybody even use 4 TB SD card for? Storing a shit-ton of pirated movies that you can watch on your phone? Aside from that I have no idea. 256 gigs is probably more than enough for anything a normal user would do on a phone.
Portable gaming Pcs. I would love to have my entire library of games accessible offline. My emulation folder alone is like 500gb. I also wouldnt call myself a normal user though. These definitely have a niche market and probably a price tag just as niche.
The target use case for large SD cards is high-resolution video recording.
Recording at 4k+ eats up space faaaaast. So you need both large-capacity as well as fast storage.
pirated
It’s not pirating if you own a physical copy like DVD or Blu-ray, it’s fair use. Fuck the studios for trying to take that away from us.
File size is a major limiting factor in high speed video and to a lesser extent convenient ultra HD digital film. At 3840x2160 (basic 4k) uncompressed 10-bit video 1 frame is about 250 MB. An hour of footage at 30 fps then is about half a terabyte. At “only” 1000 fps you would burn through an 8 TB SD card in… 32 seconds.
I have a convertible laptop with a MicroSD slot. A 4TB card would be great for backups.
ah finally, i can buy a micro sd card for 500 dollars, the same price as a gazillion terabyte harddrive, and get less reliability out of it.
yeah, but you can carry it with you at all times if your phone takes an SD card.
although, can they use one that large, or is there some restriction?
I’d say it depends on the phone.
I think most phones have a 1tb cap … But nowadays most phones don’t have SD card slots so I don’t know where that has gone
Why would someone wanting to store huge amounts of data put it on a storage device that is the most fragile/short lived?
Steam deck
Right, the 1Tb of internal storage and the 1Tb SD card is still really cramped if you play a lot of games
My GoPro can record 4k@30fps. A 20-25min video is 5+gb. The newer GoPros will do 8k@60fps i believe, maybe only 30fps. That will take up a lot more space.
The cards have to be the higher speed cards to be able to record those resolutions, but if I were a person that recorded a lot of stuff, having a card that large would be nice for a day long session.
I bought a 1TB SD card for my go pro/drone the other day. In theory it’s good for 16 hours of recording non stop.
I also have both a 512gb and a 256gb sd card for my dash cam, I’d really like to get a compatible 1TB card, but 4TB would be even nicer. Maybe I’d be able to go a month without offloading the card.
Games, the easiest way to expand the storage on a Steam Deck is a micro sd card.
SD card is limited to 100MB/s iirc.
It may be simplest, but it’s far from ideal.
I have an SD card with windows installed so I can run windows games without dual booting. It takes a while to startup, but is fine once it gets going.
Certainly not ideal, but that’s a whole OS and it’s decent.
Given some reviews I’ve seen, it’s more than good enough for games. Loading times may be a bit longer, but not that bad. HDDs are in that range, and plenty of people use HDDs for gaming.
I can’t even imagine going back to an HDD for gaming.
I was recently given a laptop to check and make sure there was no info on it before disposal, and it took so long to boot into Windows and get into a usable state, I legit thought it was faulty.
And the worst thing was, that was a fresh install. Somebody had already cleared it.
Games are just so stupidly big now. They’re pushing 200GB. To fill 16GB RAM from SD (and not all games load that much) would take 3 minutes. The SSD can do that in about 6 seconds.
Yeah, there’s no way I’d be playing a 200GB game on something like a Steam Deck. Most games I’m interested in playing on a SD is something like 20-50GB, and most of that doesn’t need to be loaded to play.
Good for straight off the camera
Video Cameras
People doing production on their MacBooks might be a target per the small form factor.
They’re awesome for modding iPods, though my music library’s probably less than 1 gb.
Flash modding iPods is a cool use case for larger-capacity SD cards. However, the limiting factors seem to be the database file for the songs on the device and the RAM available.
At a certain point you get diminishing returns on the card capacity as you couldn’t fill up the card with songs and have them all be indexed without the iPod crashing. In these situations, one can be fine staying at 128 or 256 GB.
Sneakernet. There’s places that don’t have access to get l good Internet and relatively inexpensive storage like this allows them to buy and trade media and consume it on inexpensive devices like a cellphone.
Why would anyone need a 24TB HDD?
Because in the time we have gone from 4GB SD cards to 4TB cards, movies have gone from being 700MB to 70Gb, and games from coming on a few cds or dvds to requiring a mountain of them - Baldurs Gate 1 came on 5 CDs, BG3 would require around 200 of them.That 4TB card has only space for 26 games, if they are as large as BG3.
The original Baldur’s Gate came on a single CD and had full install size of under 600MB. It was also possible to do a partial install and to load files off the CD at runtime.
Last I remember, Baldurs Gate was on 6 separate discs, but I haven’t installed it from those in probably 20 years.
An uncompressed CD audio soundtrack, maybe?
(That doesn’t appear to be the case for Baldur’s Gate in particular since the discs pictured in the listing have “compact disc data storage” logos, but I do remember some '90s games being like that.)
In this case, the question was rhetorical - the original release of BG1 takes 5 CDs, and the sixth is the Tales of the Sword Coast expansion. Installed the game takes around 2.8GB IIRC. They did eventually re-release it as only a 3 CD set because they could cram more data on a single CD by then.
You could do that with a lot of PS1 games. The first track was data, the rest were just regular CD audio tracks.
This got rarer later on, once they realised the could fill the discs with FMV sequences instead.
This got rarer later on, once they realised the could fill the discs with FMV sequences instead.
Speaking of PS1 games and disk-filling FMVs: Final Fantasy 7 on the PSX comes on 3 disks but the actual game itself is duplicated on all of them and you can swap them out during gameplay, and the only thing that happens is that it plays the wrong FMVs.
It all breaks down to the actual “game” taking 133MB, plus few hundred for the uncompressed pre-rendered backgrounds, out of the available ~1.8GB (according to this old post about how a Nintendo DS port could easily fit on a 256MB flash cart.)
short term storage of uncompressed high resolution data
I don’t think microSD has the write speed for that, might be more useful for HD surveillance cameras
Uncompressed 4k stream @ 30fps and 24bpp would be 5.7 GB/s. The top regular SD card speed, UHS-III, maxes at 0.6 GB/s. SD Express, where a PCIe lane is added, goes to 3.9 GB/s.
So, yeah, going to need at least some compression. Good news is that just a little compression can go a long way.
Even full 4K HDR Blu-ray rips come in at about 30GB an hour.
That’s 500MB per minute which just about fits in the 10MB/s of UHS Class 1.
I would consider those fairly standard these days. You’d have to have picked an extra shitty AliExpress special to not have your card meet that.
Yeah pictures and videos is all I can think of. I am no photophile but I assume some small digital camera benefits from storage of the micro variety. Has me thinking of the 2015 movie Victoria, 140m straight, one shot, no cuts, and actually a good movie, pretty amazing stuff.
Unmodded low-end steam deck.
Security camera run time.
DSLR for events.
The mockup image is kinda misleading (article admits its crappy lol).
afaik there aren’t any current microSD cards 1TB+ that have a u3 or even u1 speed because the increase in storage size comes at the cost of speed.
The development is definitely cool, but the physical size of a microSD is probably very challenging to design around without sacrificing something.






























