[Qemu-devel] real cow is not working

[Jens Arm]

Hi

Looks like real cow is not working. If I do ... I get error:

Creating org image:
address@hidden qemu]$ qemu-img create -f raw OrosO 1G
Formating 'OrosO', fmt=raw, size=1048576 kB

Installing ROS:
address@hidden qemu]$ qemu -hda OrosO -cdrom ReactOS.iso -m 192 -boot d

creating the cow:
address@hidden qemu]$ qemu-img create -b OrosO -f qcow ros
Formating 'ros', fmt=qcow, backing_file=OrosO

Starting qemu with cow-image is failing:
address@hidden qemu]$ qemu -hda ros -m 192        
qemu: could not open hard disk image 'ros'


Any hints?

Is it possible to use a cow or qcow image as base for a real cow image or do I 
need a raw ?

Jens