How to stop attached USB device / send IRP_MN_REMOVE_DEVICE?

Simon 'corecode' Schubert corecode at
Wed Aug 15 01:19:27 PDT 2007

Dag-Erling Smørgrav wrote:
> Sven Hazejager <sven-freebsd at> writes:
>> No, camcontrol does not support this over USB. Windows XP demonstrates
>> it is technically possible, and I do not believe it is fully safe to
>> disconnect the drive (even when unmounted), as the drive then is not
>> able to park its heads, which it DOES do under XP.
> All modern disks (since at least the early 1990s) automatically park
> their heads when they lose power.  There is no need to do it in
> software.

So it seems that windows is switching off the power of the devices when you select "eject".  I can see that some users might feel more comfortable with this behaviour.


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