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To create an lfs64 volume, use -w 64. You can also force a 32-bit volume with -w 32, but this will fail on devices thta are too large. lfs64 is the default for devices > 1TB. (1TB rather than 2TB because daddr_t is signed and negative block numbers can cause interesting complications.) For now print a warning that the lfs64 format isn't finalized, because it isn't. For now any lfs64 use should be limited to test data, benchmarking, and so forth.