grub2-probe -v --target=fs --device /dev/sdd2
grub2-probe: info: adding `hd1' -> `/dev/sda' from device.map.
grub2-probe: info: adding `hd2' -> `/dev/sdb' from device.map.
grub2-probe: info: adding `hd3' -> `/dev/sdc' from device.map.
grub2-probe: info: adding `hd0' -> `/dev/sdd' from device.map.
grub2-probe: info: adding `hd4' -> `/dev/nvme0n1' from device.map.
grub2-probe: info: /dev/sdd2 is present.
grub2-probe: info: Looking for /dev/sdd2.
grub2-probe: info: /dev/sdd is a parent of /dev/sdd2.
grub2-probe: info: /dev/sdd2 starts from 16779264.
grub2-probe: info: opening the device hd0.
grub2-probe: info: drive = 3.
grub2-probe: info: the size of hd0 is 1953459617.
grub2-probe: info: drive = 3.
grub2-probe: info: the size of hd0 is 1953459617.
grub2-probe: info: Scanning for DISKFILTER devices on disk hd0.
grub2-probe: info: Scanning for mdraid1x devices on disk hd0.
grub2-probe: info: Scanning for mdraid09 devices on disk hd0.
grub2-probe: info: Scanning for mdraid09_be devices on disk hd0.
grub2-probe: info: Scanning for dmraid_nv devices on disk hd0.
grub2-probe: info: Scanning for ldm devices on disk hd0.
grub2-probe: info: scanning hd0 for LDM.
grub2-probe: info: no LDM signature found.
grub2-probe: info: Scanning for lvm devices on disk hd0.
grub2-probe: info: no LVM signature found.
grub2-probe: info: Scanning for DISKFILTER devices on disk hd0.
grub2-probe: info: Scanning for mdraid1x devices on disk hd0.
grub2-probe: info: Scanning for mdraid09 devices on disk hd0.
grub2-probe: info: Scanning for mdraid09_be devices on disk hd0.
grub2-probe: info: Scanning for dmraid_nv devices on disk hd0.
grub2-probe: info: Scanning for ldm devices on disk hd0.
grub2-probe: info: scanning hd0 for LDM.
grub2-probe: info: no LDM signature found.
grub2-probe: info: Scanning for lvm devices on disk hd0.
grub2-probe: info: no LVM signature found.
grub2-probe: info: Scanning for DISKFILTER devices on disk hd0.
grub2-probe: info: Scanning for mdraid1x devices on disk hd0.
grub2-probe: info: Scanning for mdraid09 devices on disk hd0.
grub2-probe: info: Scanning for mdraid09_be devices on disk hd0.
grub2-probe: info: Scanning for dmraid_nv devices on disk hd0.
grub2-probe: info: Scanning for ldm devices on disk hd0.
grub2-probe: info: scanning hd0 for LDM.
grub2-probe: info: no LDM signature found.
grub2-probe: info: Scanning for lvm devices on disk hd0.
grub2-probe: info: no LVM signature found.
grub2-probe: info: Scanning for DISKFILTER devices on disk hd0.
grub2-probe: info: Scanning for mdraid1x devices on disk hd0.
grub2-probe: info: Scanning for mdraid09 devices on disk hd0.
grub2-probe: info: Scanning for mdraid09_be devices on disk hd0.
grub2-probe: info: Scanning for dmraid_nv devices on disk hd0.
grub2-probe: info: Scanning for ldm devices on disk hd0.
grub2-probe: info: scanning hd0 for LDM.
grub2-probe: info: no LDM signature found.
grub2-probe: info: Scanning for lvm devices on disk hd0.
grub2-probe: info: no LVM signature found.
grub2-probe: info: Partition 0 starts from 2048.
grub2-probe: info: Partition 1 starts from 16779264.
grub2-probe: info: /dev/sdd2 is present.
grub2-probe: info: Looking for /dev/sdd2.
grub2-probe: info: /dev/sdd is a parent of /dev/sdd2.
grub2-probe: info: /dev/sdd2 starts from 16779264.
grub2-probe: info: opening the device hd0.
grub2-probe: info: drive = 3.
grub2-probe: info: the size of hd0 is 1953459617.
grub2-probe: info: drive = 3.
grub2-probe: info: the size of hd0 is 1953459617.
grub2-probe: info: Scanning for DISKFILTER devices on disk hd0.
grub2-probe: info: Scanning for mdraid1x devices on disk hd0.
grub2-probe: info: Scanning for mdraid09 devices on disk hd0.
grub2-probe: info: Scanning for mdraid09_be devices on disk hd0.
grub2-probe: info: Scanning for dmraid_nv devices on disk hd0.
grub2-probe: info: Scanning for ldm devices on disk hd0.
grub2-probe: info: scanning hd0 for LDM.
grub2-probe: info: no LDM signature found.
grub2-probe: info: Scanning for lvm devices on disk hd0.
grub2-probe: info: no LVM signature found.
grub2-probe: info: Scanning for DISKFILTER devices on disk hd0.
grub2-probe: info: Scanning for mdraid1x devices on disk hd0.
grub2-probe: info: Scanning for mdraid09 devices on disk hd0.
grub2-probe: info: Scanning for mdraid09_be devices on disk hd0.
grub2-probe: info: Scanning for dmraid_nv devices on disk hd0.
grub2-probe: info: Scanning for ldm devices on disk hd0.
grub2-probe: info: scanning hd0 for LDM.
grub2-probe: info: no LDM signature found.
grub2-probe: info: Scanning for lvm devices on disk hd0.
grub2-probe: info: no LVM signature found.
grub2-probe: info: Scanning for DISKFILTER devices on disk hd0.
grub2-probe: info: Scanning for mdraid1x devices on disk hd0.
grub2-probe: info: Scanning for mdraid09 devices on disk hd0.
grub2-probe: info: Scanning for mdraid09_be devices on disk hd0.
grub2-probe: info: Scanning for dmraid_nv devices on disk hd0.
grub2-probe: info: Scanning for ldm devices on disk hd0.
grub2-probe: info: scanning hd0 for LDM.
grub2-probe: info: no LDM signature found.
grub2-probe: info: Scanning for lvm devices on disk hd0.
grub2-probe: info: no LVM signature found.
grub2-probe: info: Scanning for DISKFILTER devices on disk hd0.
grub2-probe: info: Scanning for mdraid1x devices on disk hd0.
grub2-probe: info: Scanning for mdraid09 devices on disk hd0.
grub2-probe: info: Scanning for mdraid09_be devices on disk hd0.
grub2-probe: info: Scanning for dmraid_nv devices on disk hd0.
grub2-probe: info: Scanning for ldm devices on disk hd0.
grub2-probe: info: scanning hd0 for LDM.
grub2-probe: info: no LDM signature found.
grub2-probe: info: Scanning for lvm devices on disk hd0.
grub2-probe: info: no LVM signature found.
grub2-probe: info: Partition 0 starts from 2048.
grub2-probe: info: Partition 1 starts from 16779264.
grub2-probe: info: /dev/sdd2 is present.
grub2-probe: info: Looking for /dev/sdd2.
grub2-probe: info: /dev/sdd is a parent of /dev/sdd2.
grub2-probe: info: /dev/sdd2 starts from 16779264.
grub2-probe: info: opening the device hd0.
grub2-probe: info: drive = 3.
grub2-probe: info: the size of hd0 is 1953459617.
grub2-probe: info: drive = 3.
grub2-probe: info: the size of hd0 is 1953459617.
grub2-probe: info: Scanning for DISKFILTER devices on disk hd0.
grub2-probe: info: Scanning for mdraid1x devices on disk hd0.
grub2-probe: info: Scanning for mdraid09 devices on disk hd0.
grub2-probe: info: Scanning for mdraid09_be devices on disk hd0.
grub2-probe: info: Scanning for dmraid_nv devices on disk hd0.
grub2-probe: info: Scanning for ldm devices on disk hd0.
grub2-probe: info: scanning hd0 for LDM.
grub2-probe: info: no LDM signature found.
grub2-probe: info: Scanning for lvm devices on disk hd0.
grub2-probe: info: no LVM signature found.
grub2-probe: info: Scanning for DISKFILTER devices on disk hd0.
grub2-probe: info: Scanning for mdraid1x devices on disk hd0.
grub2-probe: info: Scanning for mdraid09 devices on disk hd0.
grub2-probe: info: Scanning for mdraid09_be devices on disk hd0.
grub2-probe: info: Scanning for dmraid_nv devices on disk hd0.
grub2-probe: info: Scanning for ldm devices on disk hd0.
grub2-probe: info: scanning hd0 for LDM.
grub2-probe: info: no LDM signature found.
grub2-probe: info: Scanning for lvm devices on disk hd0.
grub2-probe: info: no LVM signature found.
grub2-probe: info: Scanning for DISKFILTER devices on disk hd0.
grub2-probe: info: Scanning for mdraid1x devices on disk hd0.
grub2-probe: info: Scanning for mdraid09 devices on disk hd0.
grub2-probe: info: Scanning for mdraid09_be devices on disk hd0.
grub2-probe: info: Scanning for dmraid_nv devices on disk hd0.
grub2-probe: info: Scanning for ldm devices on disk hd0.
grub2-probe: info: scanning hd0 for LDM.
grub2-probe: info: no LDM signature found.
grub2-probe: info: Scanning for lvm devices on disk hd0.
grub2-probe: info: no LVM signature found.
grub2-probe: info: Scanning for DISKFILTER devices on disk hd0.
grub2-probe: info: Scanning for mdraid1x devices on disk hd0.
grub2-probe: info: Scanning for mdraid09 devices on disk hd0.
grub2-probe: info: Scanning for mdraid09_be devices on disk hd0.
grub2-probe: info: Scanning for dmraid_nv devices on disk hd0.
grub2-probe: info: Scanning for ldm devices on disk hd0.
grub2-probe: info: scanning hd0 for LDM.
grub2-probe: info: no LDM signature found.
grub2-probe: info: Scanning for lvm devices on disk hd0.
grub2-probe: info: no LVM signature found.
grub2-probe: info: Partition 0 starts from 2048.
grub2-probe: info: Partition 1 starts from 16779264.
grub2-probe: info: opening hd0,gpt2.
grub2-probe: info: drive = 3.
grub2-probe: info: the size of hd0 is 1953459617.
grub2-probe: error: ../grub-core/fs/minix.c:578:not a directory.