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

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.

So, we come back to the original question: how to send an IRP_MN_REMOVE_DEVICE event?

Regards,

Sven

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