id summary reporter owner description type status component version resolution keywords cc guest host 6388 delete snapshot deletes primary master disk rkit "In a szenario with differencing disks and snapshots deleting the last snapshot removes the primary master disk for the VM. [[BR]] I have disks as follows: [[BR]] {{{ Windows XP core disk --- Windows XP Base disk (differencing disk with Windows XP core disk as parent) }}} [[BR]] The VM 'Windows XP Base' uses 'Windows XP Base Disk' as primary master. [[BR]] Two snapshots are created:[[BR]] {{{ snapshot 1 ---- snapshot 2 --------current state }}} [[BR]] I then tried to delete snapshots 1 and 2 and merge their contents into 'Windows XP Base disk'. Deleting snapshot 2 (which is very small) leaves[[BR]] {{{ snapshot 1 ---- current state }}} [[BR]] and everything looks normal. [[BR]] Deleting snapshot 1 takes longer to merge and leaves only 'current state', but disk 'Windows XP Base disk' is gone. The VM is based on a disk in the machine's snapshot directory, which has 'Windows XP Core disk' as parent. [[BR]] The VM is no longer bootable, VB reports that ntoskrnl.exe cannot be found.[[BR]] I didn't try it yet, but it seems that restoring the VM from a backup would need heavy editing of the XML files, because the VMs information is not only kept in the .xml, but is strongly connected to the disk / snapshot hierarchy definition in the within the Virtualbox.xml file. " defect closed virtual disk VirtualBox 3.1.4 fixed delete snapshot Windows Windows