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The issue is that the VFAT config drive is a so called RAW partition (e.g. on Linux you'd mount it directly as /dev/sdb, not /dev/sdb1) and this is not supported by Windows, where a partitioning scheme is required (e.g. MBR) in order to mount a partition.

What we can do is to extract the raw block data from the disk, put them in a vfd file and mount that as a loopback device (Windows 2008 R2 / Windows 7 and above). Being this a non trivial implementation we always left it as a low priority feature request due to the availability of the ISO option.

Note: the libvirt (KVM) live migration issue with config drives has been fixed in Juno:

This bug fix is worth a backporting to Icehouse as well IMO.