Hi, The file A''s format is raw.Then create file B like this: vhd-util snapshot -n B -p A -m Using a configure file corresponding to file B,I create a VM successfully. Then file C is generated as the following: vhd-util snapshot -n C -p B Using a configure file ,which is similar to the one file B use,corresponding to file C,I cannot create a VM successfully with file C. By vnc connected, the prompt "No Bootable Device" is displayed. How could I create a VM with a vhd format image which is also based on a vhd file? hxk _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users