How to eject an USB disk on FreeBSD

[Olivier Nicole]

Hello,

Is there a command in FreeBSD that ejects a USB disk like in Windows?

I mount the USB disk with automount daemone (amd).

I have a script that access this disk and force an umount at the end
of the script.

But anyone accessing the disk will have amd re'mount the disk and at
the time I unplu the disk, problem may occur because the disk is still
mounted and in use.

I would like to have a command that makes the disk/USB port physically
inaccessible, so at the end of the script a user cannot access the
disk again.

Like in Windows after stopping a USB mass storage device, one has to
unplg and replug the disk if he wants to access it again.

TIA,

Olivier