First time for everything

[jeffry killen]

Hello;
How is a usb device accessed on Freebsd.
I installed an SATA drive in a usb enclosure
and plugged in into usb port on the machine.
Console message indicated detection of the
device when the power switch for the usb enclosure
  was set to on.
When I did mount -w /dev/usb (or usbN) I got
special device unknown.
Or mount -w /dev/usb (or usbN) /mnt
needs block device.

There is a first time for everything.
man usb does not tell me.
and Absolute BSD (M. Lucas) does
not say anything about usb devices
let alone how to access them.

Thank you for patience and guidance
Jeff K.