Note: while this is not an exact duplicate, this question is a duplicate in that it asks where the limitation is located (software/hardware ...). So I think marking this as a duplicate is warranted, even though my question was model-specific.

I have an S9+ from Samsung and I am considering to upgrade to 512 GB or even 1 TB as it would make space for Kiwix ZIM files.

However, Samsung marketing material suggests a limit of 400 GB (i.e. 400x1000x1000x1000 Byte). This sounds arbitrary (not the usual power of two and the discrepancy between GiB and GB which may be accounted for by reserved space - in case of corruption - doesn't change that). Now, perhaps there is a technical reason that I am unaware of, but from the OS side (Linux/Android) I can't understand why there would be a limitation to 400 GB. SDXC seems to be the supported standard and should support up to 2 TiB (i.e. 2x1024x1024x1024x1024 Byte).

Is this limit simply owed to what was available around the release of the S9+ or is it an artificial limitation imposed by Samsung customizations to Android, or is there perhaps no limitation?

  • Sometimes I wish there was a comment to help me improve my question. Puzzling downvote ... – 0xC0000022L Oct 13 '19 at 20:49
  • There was a question very similar to this, were the conclusion was, that the advertised maximum capacity is the capacity that is guaranteed to work and was the largest they had at the time. There are numerous phones, that advertise 16 or 32GB of maximum SD card capacity and work fine with 64 oder even 128GB. – GiantTree Oct 14 '19 at 7:09
  • @GiantTree thanks, do you happen to remember which previous question that was? I noticed plenty of other questions similar to mine, but not for the same phone model. And since these others all referred to specific phone models I didn't think anything of asking for my specific phone model. Although it wouldn't strictly be a duplicate, it might be worthwhile to mark mine and other questions as dupes of that one question you mention, because if that is the case it answers it enough to make a call as to whether one wants to buy such SD card or not. – 0xC0000022L Oct 14 '19 at 8:34
  • I don't think it's about model or manufacturer, it should be a general question about the capability of SD Host Controller. If you need information about a specific device, ask the manufacturer directly that where at hardware or software level they put the limitation on SD card size, which they would never reveal. So mostly answers to such questions would be guesses, ideas or opinions. – Irfan Latif Oct 14 '19 at 11:09
  • 1
    @0xC0000022L this question IIRC: android.stackexchange.com/a/129539/86358 – GiantTree Oct 14 '19 at 17:41

I can now confirm that the S9+ supports a 1 TB μSD card just fine.

After a colleague had outfitted his phone with a 512 GB card, I decided to give it a try, because it was already above the limit Samsung claimed was supported but well below the limit one should expect for SDXC (see my question).

Proof of a 1 TB card working in the S9+

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