Fail to install FreeBSD 11.1 beta or 12-current on Hyper-V GEN2 mode, because the CD/DVD device was detached.
This issue occurs if CD/DVD was attached on 2nd SCSI controller or if there is no HDD attached before the CD/DVD slot.
The root cause is Hyper-V CD/DVD simulation set a unknown version number (0) for INQUIRY cmd.
The fix here manually sets the version number to SPC-3 in order to let SCSI CAM continue to probe the device with "REPORTLUN" commands.
See the bug https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=220790