[dale_glass]

I'm honestly not sure which counts for this purpose, physical or virtual? And which fraction do you get to use on HURD?

But still, 256 TiB is just a dozen drives these days. Not a very consumer-like configuration, but very much a limit you can run against.

[sparkie]

48-bit virtual addresses are the most common in use today. All AMD, ARM64 processors, and most of Intel's. Only recent Intel chips support PML5 (5-level paging), giving them 57-bits of virtual address space. There are no 64-bit processors that can use a full 64-bits of virtual address space.