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This table is referring to volume size, the virtual hard disk device that is created by EBS and presented to your instance, which is different from the file system size which you are referring to via ext/xfs which can span multiple volumes/disks.
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I see your point.
But I provisioned a single IO2 EBS volume with 20TiB, which can go as high as 64TiB for a single volume. I still cannot fathom the correlation between the block size on the left to the max volume size on the right.
There is the "EBS block size", which is how it presents itself to the OS (descibred as "512-byte sectors" on the same link). There is the "industry default for logical data blocks", which I assume they are talking about filesystem block sizes, which as far as I know have to go hand-to-hand with the Linux Kernel page size, for instance.
So what do they mean when they list that "The EBS-imposed limit on volume size (64 TiB) is currently equal to the maximum size enabled by 16-KiB data blocks"?