Linux 6.13 Adds Support For Ultra Capacity SD Cards "SDUC" For 2TB To 128TB Storage

[oiaohm]

Erofs is great for erotic audio books.

That last one I know you did as a joke. There have been a few cheap ebook readers and android devices that have done something really wrong.

https://stackoverflow.com/questions/25847018/sd-card-erofs-read-only-file-system

Yes format sd card with erofs. So yes read only in it name is kind of right and wrong it can operate as a append only file system for a while. So yes you can end up with your erotic audio books on Erofs then not be able to delete them quickly because you used particular devices.

[caligula]

At these capacities, it makes more sense to format these cards with NTFS on Windows or ext4/xfs on Linux.

Indeed, for my cameras and mp3 players I often prefer NTFS with compression and alternate streams or bcachefs. ZFS with transparent compression and inline AES encryption and Reiser4 are also good for those 32-bit digital cameras. ZFS is particularly good for 16-bit mp3 players. Erofs is great for erotic audio books.

[oiaohm]

The only purpose of an SDUC card is to serve as recordable media for high-resolution still and video cameras, so it makes no sense to do what you say, as nobody will be using them as full-time computer storage.

Linux world normally does not pay to say nobody. We do have SDXC to compact flash adapters and there are compact flash to sata adapters.. The fun of dongle stacking. Someone at some point will have some adapter for SDUC to something and will put Linux on it this is a basic given. Will it make sense most likely no but they will do it anyhow and it could luck out as full time storage.

https://dmitry.gr/?proj=07.%20Linux%20on%208bit&r=05.Projects

Kind of like saying that nobody would run Linux on an absolute slow 8 bit micro-controller and then someone goes and proves that wrong. Old saying red flag to bull applies more to Linux people than bulls.

[TheLexMachine]

At these capacities, it makes more sense to format these cards with NTFS on Windows or ext4/xfs on Linux.

The only purpose of an SDUC card is to serve as recordable media for high-resolution still and video cameras, so it makes no sense to do what you say, as nobody will be using them as full-time computer storage.

[Quackdoc]

How do you design a filesystem for longevity? There's probably only so many tricks you can do to reduce read/write cycles, the hardware is still going to break at some point. You should expect drives to fail and have a backup for important data. I don't think I'd be using a 128 TB SD card (crazy, if such a thing actually comes to market because that's more storage than conventional SSDs and hard drives have right now) for anything important.

Technically? I dunno, I know little when it comes to filesystems, however F2FS seems to have done an excellent job with it's goals

[Weasel]

But that's what Flash Translation Layers are supposed to address. Feels kinda silly to bloat filesystems with more logic.

Except flash microcontroller CPUs are orders of magnitude weaker than your main CPU so it makes sense to actually move this to your filesystem which utilizes your beefy CPU. Then the microcontroller won't have to do shit. It's also likely it does its job subpar considering its weak processing power (and heat issues), so it takes compromises probably.

Anyway at 128 TB and with 1 GB/s entire time (which is extremely unlikely given heat constraints) it would take you like a day and a half just to scan this thing once.

[oiaohm]

At these capacities, it makes more sense to format these cards with NTFS on Windows or ext4/xfs on Linux.

Yet the SD standard still says exfat as the recommend default..

[uxmkt]

at that size, I would be massively worried about longevity, I wonder if there is a file system dedicated spefically to sd card specific storage for longevity.

But that's what Flash Translation Layers are supposed to address. Feels kinda silly to bloat filesystems with more logic.

[ahrs]

at that size, I would be massively worried about longevity, I wonder if there is a file system dedicated spefically to sd card specific storage for longevity.

How do you design a filesystem for longevity? There's probably only so many tricks you can do to reduce read/write cycles, the hardware is still going to break at some point. You should expect drives to fail and have a backup for important data. I don't think I'd be using a 128 TB SD card (crazy, if such a thing actually comes to market because that's more storage than conventional SSDs and hard drives have right now) for anything important.

[jaxa]

The Secure Digital Ultra Capacity format supports cards up to 128TB and up to 985MB/s speeds.

It has nothing to do with speeds as far as I know. What happened is that Wikipedia printed this "fact" because SDUC and SD Express (PCIe 3.1 x1 - 985 MB/s) were announced in June 2018. Then SD 8.0 in 2020 added more speeds, up to 3938 MB/s using PCIe 4.0 x2.

Unfortunately, the format is in decline, being challenged by CFexpress in professional products, and microSD is being removed from many smartphones. The high speeds of SD Express may be impossible to hit due to overheating.