[libvirt-users] Corrupt image?

I took a gzipped qcow2 image And do a gunzip on it But what? [root@mjw vm]# fdisk w.qcow2 -l Disk w.qcow2: 0 MB, 0 bytes 255 heads, 63 sectors/track, 0 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 [root@mjw vm]# The disc should not be 0 mb!!! The disc worked before i gzipped it