Also, the grub-installer script that runs at install time identifies the fioa device's partition label as loop.
Oct 23 18:17:10 grub-installer: info: Identified partition label for /dev/fioa2: loop
When installing to the ATA device, the sda devices are seen as gpt:
Oct 24 15:50:51 grub-installer: info: Identified partition label for /dev/sda2: gpt
Also, the grub-installer script that runs at install time identifies the fioa device's partition label as loop.
Oct 23 18:17:10 grub-installer: info: Identified partition label for /dev/fioa2: loop
When installing to the ATA device, the sda devices are seen as gpt:
Oct 24 15:50:51 grub-installer: info: Identified partition label for /dev/sda2: gpt