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ZAC (Zoned-device ATA Command set) is the standard for addressing SMR (shingled magnetic recording) devices over SATA. Drives indicate their support for ZAC in their IDENTIFY block. Print whether and how a drive supports ZAC in the output of "camcontrol identify". Reviewed by: ken, imp MFC after: 3 weeks Sponsored by: Spectra Logic Corp Differential Revision: https://reviews.freebsd.org/D13171