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

[phoronix]

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

Linux 6.13 has merged support for the Secure Digital Ultra Capacity "SDUC" standard for 2TB to 128TB storage capacity SD cards...

https://www.phoronix.com/news/Linux-6.13-SDUC-Ultra-Capacity

[Sonadow]

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

[microcode]

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

Setting aside inherent capacity limitations, filesystem choice has almost nothing to do with the overall capacity of devices. exFAT may be perfectly suitable.

[Quackdoc]

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.

[dragorth]

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

The expectation is, these are meant to be used in Camera/Film use cases, so having a set standard FS that all devices are compatible with is useful and mandated by the spec in this case. It can support other FS types, but the one guaranteed to work with all devices is ExFat.

[ridge]

At least F2FS will hold us over until cards, god forbid, exceed 16TB total capacity.

[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.

[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.

[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.

[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..