[root@archerpc ~]# grub-probe --device-map=/boot/grub/device.map --target=device /boot/grub -v
grub-probe: info: the size of fd0 is 8
grub-probe: info: the size of fd0 is 8
grub-probe: info: the size of hd0 is 976773168
grub-probe: info: the size of hd0 is 976773168
grub-probe: info: the size of hd0 is 976773168
grub-probe: info: the size of hd0 is 976773168
grub-probe: info: the size of hd0 is 976773168
grub-probe: info: the size of hd1 is 976773168
grub-probe: info: the size of hd1 is 976773168
grub-probe: info: the size of hd1 is 976773168
grub-probe: info: the size of fd0 is 8
grub-probe: info: the size of fd0 is 8
grub-probe: info: the size of hd0 is 976773168
grub-probe: info: the size of hd0 is 976773168
grub-probe: info: the size of hd0 is 976773168
grub-probe: info: the size of hd0 is 976773168
grub-probe: info: the size of hd0 is 976773168
grub-probe: info: the size of hd1 is 976773168
grub-probe: info: the size of hd1 is 976773168
grub-probe: info: the size of hd1 is 976773168
grub-probe: info: changing current directory to /dev
grub-probe: info: changing current directory to v4l
grub-probe: info: changing current directory to by-path
/dev/sda3
[root@archerpc ~]#