I've added to my config options USB_DEBUG
and turned on hw.usb.debug: 1 and hw.usb.umass.debug: 1 

This time the dump finished.

  DUMP: 95.35% done, finished in 0:03 at Thu Feb  9 23:06:21 2017
  DUMP: 99.23% done, finished in 0:00 at Thu Feb  9 23:08:19 2017
  DUMP: DUMP: 99117484 tape blocks
  DUMP: finished in 4916 seconds, throughput 20162 KBytes/sec
  DUMP: DUMP IS DONE

and log filled with-

Feb  9 22:39:43 Thinkpad kernel: usbd_pipe_enter: enter
Feb  9 22:39:43 Thinkpad kernel: usbd_pipe_start: start
Feb  9 22:39:43 Thinkpad kernel: usbd_transfer_done:
err=USB_ERR_NORMAL_COMPLETION
Feb  9 22:39:43 Thinkpad kernel: usbd_callback_wrapper_sub:
xfer=0xfffffe000140c868 endpoint=0xfffff8005fdbb968 sts=0 alen=65536,
slen=65536, afrm=1, nfrm=1
Feb  9 22:39:43 Thinkpad kernel: usbd_transfer_submit:
xfer=0xfffffe000140cac8, endpoint=0xfffff8005fdbb800, nframes=1, dir=read
Feb  9 22:39:43 Thinkpad kernel: usb_dump_endpoint:
endpoint=0xfffff8005fdbb800 edesc=0xfffff8005fa7b692 isoc_next=0
toggle_next=0 bEndpointAddress=0x81
Feb  9 22:39:43 Thinkpad kernel: usb_dump_queue: endpoint=0xfffff8005fdbb800
xfer: 
Feb  9 22:39:43 Thinkpad kernel: usbd_pipe_enter: enter
Feb  9 22:39:43 Thinkpad kernel: usbd_pipe_start: start
Feb  9 22:39:43 Thinkpad kernel: usbd_transfer_done:
err=USB_ERR_NORMAL_COMPLETION

I wonder if this is due to slightly reduced throughput? Will try again
without logging.



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