Other Equivalent to Arch Linux "udisksctl power-off -b /dev/sdX" on FreeBSD and other questions

-Is there a command to power off an external HDD attached to an USB port
on FreeBSD that is the equivalent to Arch Linux "udisksctl power-off -b /dev/sdX"?
-Can we stop the operating system from applying further changes to the HDD
before we can spin it down and power it off?
-How can we do this to an external HDD drive partitioned as either
fat32, exfat, ntfs, unixfs, ext4 or zfs?
-What is the main difference between HDD ATA states like "sleep, idle and standby"?
Do they also apply to USB drives?
-Is there a way to mount external drives sync-only by default on FreeBSD?
 
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