I'm trying to get a McAfee encrypted USB stick to be usable under QNX4.  I have succeeded to a certain extent, but not 
to the extent of being able to remove the device and subsequently re-insert it and be able to access it.  In particular 
I'm performing the following steps:

1) Insert disk and finger-swipe to authenticate.

2) # io-usb
   At this point, the output of usb shows that the device is recognized.

3) # Fsys.umass
   At this point, the device /dev/hd1 is created.

4) # Fatfsys
   At this point, the encrypted portion of the disk is accessible as /dos/c.
   The unencrypted read-only portion does not appear.

5) # slay Fatfsys
   /dos/c disappears.

6) # slay Fsys.umass
   /dev/hd1 still exists.

7) # rm /dev/hd1

8) # slay io-usb

9) Remove and re-insert disk, and authenticate.

10) # io-usb

11) # Fsys.umass
    => "Can't attach to Fsys (Resource busy)

Any way I can recover?  I'm using the July 2010 USB stack.