Hi, > bhyve -c 2 -s 0,hostbridge -s 3,ahci-hd,/dev/zvol/my_zroot/VM/img/win7/disk0 For win7/2k8*, the sector size presented to the guest has to be forced to 512 bytes i.e. for the ahci-cd slot, the config would look like: -s 3,ahci-hd,/dev/zvol/my_zroot/VM/img/win7/disk0,sectorsize=512 later, Peter.