From owner-freebsd-hackers@FreeBSD.ORG  Fri Mar 27 08:34:46 2015
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Cc: "freebsd-hackers@freebsd.org" <freebsd-hackers@freebsd.org>,
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>
> My understanding is that it's impossible; the drive-managed SMR drives
> present themselves as ordinary disks.  But, if their design is similar
> to the upcoming host-aware SMR drives, then the band size will be on
> the order of a few hundred megabytes.
>
i think it is few tracks at most now.