Trying to install img in a virtualBox

I downloaded the 2015 img file and converted it to .vdi to run in
a VirtualBox. I make the CPU PAE. The IDE CD drive is empty, and I point
the SATA controller to debian-hurd.vdi.

The boot of debian-hurd starts, but then hangs. I am used to booting an
ISO in VD, but not image files, and I suspect I've not set up the
virtual machine correctly.

  After partitions checking I get 
  module 0 ext2
  module 1 exec /hurd/exec/
  2 multiboot modules
  task loaded ext2F's
  task loaded /hurd/exec/
  start ext2fs: extfs: device:hd0s1: No such device or address

I don't know what to make of this.