How to stop attached USB device / send IRP_MN_REMOVE_DEVICE?

soralx at soralx at
Tue Aug 14 04:17:37 PDT 2007

On Tue, 14 Aug 2007 03:08:33 -0700
soralx at wrote:

> > 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)

sorry, I meant to say that `camcontrol da? stop` does not power down
the device anymore; nonetheless, it is probably safe to disconnect it
> tested with SCSI hard drives and Adaptec 29160
> > Sven
> [SorAlx]  ridin' VS1400

[SorAlx]  ridin' VS1400

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