From owner-freebsd-hackers@freebsd.org  Fri Jul 10 17:28:32 2015
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Subject: Re: format/newfs larger external consumer drives
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> When building a filesystem (FFS) on these 1/2/3/4TB external USB
> drives, any suggestions?  E.g., changing block sizes?  Cut into
> multiple slices to make fsck's job easier (as well as *recovery*)?

i would assume you will most likely store large files.

newfs -m 0 -i 262144 -b 65536 -f 8192 -U /dev/yourdisk

and it will be fast to fsck.