подскажите по dd

Создаю образ так
dd if=/dev/zero of=/var/images/image1.img bs=1M count=4096

В итоге получаю следующее...
[root@xen ~]# xm create win2k3
Using config file "./win2k3".
Error: Disk image does not exist: /var/images/image1.img
[root@xen ~]# ls -al /var/images/image1.img
-rw-r--r-- 1 root root 4294967296 2007-10-23 12:14 /var/images/image1.img
[root@xen ~]# ls -alh /var/images/image1.img
-rw-r--r-- 1 root root 4.0G 2007-10-23 12:14 /var/images/image1.img
[root@xen ~]# du -s /var/images/image1.img
4198408 /var/images/image1.img
[root@xen ~]# du -sh /var/images/image1.img
4.1G    /var/images/image1.img

Что не так то?