How to stop attached USB device / send IRP_MN_REMOVE_DEVICE?

soralx at soralx at
Tue Aug 14 04:08:32 PDT 2007

> 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?

`camcontrol da? stop` seemed to do the trick before (5.2.1-R, AFAIR),
but now I'm not sure (looks like it doesn't)

tested with SCSI hard drives and Adaptec 29160

> Sven

[SorAlx]  ridin' VS1400

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