How to stop attached USB device / send IRP_MN_REMOVE_DEVICE?

Sven Hazejager sven-freebsd at
Tue Aug 14 02:40:14 PDT 2007

Hi all,

Is there a tool under FreeBSD 6.2 that properly stops a USB device, 
equivalent to Windows XPs Safely Remove Hardware? I noticed that Windows 
sends a IRP_MN_REMOVE_DEVICE command, after which my LaCie external HDD 
spins down. Same applies to any USB stick: the light goes out on the 
stick. I would like to do this under FreeBSD too. camcontrol eject or stop 
don't do anything.

So, the question really is: how to send a IRP_MN_REMOVE_DEVICE command?



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