id summary reporter owner description type status component version resolution keywords cc guest host 6149 unable to unmount host cd drive VERR_DEV_IO_ERROR ubuntu Richard "This is happening to all of my windows guests windows xp and windows 7 32 bit and 64 bit on ubuntu 64. The only way I've found to unmount a disk after mounting is to shutdown the system and go into the settings and set the drive from host to none. " defect closed virtual disk VirtualBox 3.1.2 duplicate Linux Windows