From that it looks like production is 130 exabytes for Seagate and Western Digital combined. Using the default block size on ZFS the limit is 128 * 1024 * 2^64

From that it looks like production is 130 exabytes for Seagate and Western Digital combined. Using the default block size on ZFS the limit is 128 * 1024 * 2^64 = 2 zettabytes. Even allowing for other manufacturers it's an order of magnitude more than global annual production.