Man

Command Section
USFS(4)                FreeBSD Kernel Interfaces Manual                USFS(4)

NAME
     usfs - USB device side support for bulk only transport mass storage

SYNOPSIS
     To compile this driver into the kernel, place the following lines in your
     kernel configuration file:

           device usb
           device usfs

     Alternatively, to load the driver as a module at boot time, place the
     following line in loader.conf(5):

           usfs_load="YES"

DESCRIPTION
     The usfs driver provides support for emulating an USB mass storage device
     when the USB stack is activated in USB device side mode (the
     usb_template(4) module is loaded and the hw.usb.template sysctl is set to
     0).

     Upon attach the driver creates a RAM disk which can be read and written.

SEE ALSO
     cfumass(4), umass(4), usb(4), usb_template(4)

HISTORY
     The usfs driver appeared in FreeBSD 8.

FreeBSD 11.1-RELEASE-p4          June 8, 2016          FreeBSD 11.1-RELEASE-p4
Command Section