Hi, I encounter a problem when making a bootable disk image because GRUB always enters a rescue shell. I want to create a disk image and install GRUB 2 on it and then use Bochs to run it. The steps are as follows. System Environment: OS: Fedora 25 x86 GRUB version: grub2-install (GRUB) 2.02~beta3 Bochs version: 2.6.9 1. Create a empty disk image. dd if=/dev/zero of=hd.img bs=$((16*63*512)) count=100 2. Create a primary partition. fdisk -u -C100 -S63 -H16 hd.img The partition table is: Device Boot Start End Sectors Size Id Type hd.img1 2048 100799 98752 48.2M 83 Linux 3. Attach the whole image to /dev/loop0 and attach the first partition to /dev/loop1 sudo losetup /dev/loop0 hd.img sudo losetup -o $((2048*512)) /dev/loop1 hd.img 4. Format the first partition to ext4 and mount it to /mnt/ sudo mkfs.ext4 /dev/loop1 sudo mount -t ext4 /dev/loop1 /mnt 5. Create GRUB directory. sudo mkdir -p /mnt/boot/grub2 6. Install GRUB 2 sudo grub2-install --boot-directory=/mnt/boot /dev/loop0 7. Start Bochs. bochs -f test.bxrc These steps are straight and simple. However, GRUB always enters a rescue shell instead of entering normal mode. When I use the set and ls command to show more information, I can only see (hd0) and the first partition (hd0,1) is disappeared. The screen output is as follows: ---------------------------------------------------- Bochs BIOS - build: 02/16/17 ata0 master: Generic 1234 ATA-6 Hard-Disk ( 49 MBytes) Press F12 for boot menu. Booting from Hard Disk... . error: no such device: c5b2c483-70c2-4212-840b-da5f965d0555. error: unknown filesystem. Entering rescue mode... grub rescue> set prefix=(hd0)/boot/grub2 root=hd0 grub rescue> ls (hd0) grub rescue> ---------------------------------------------------- Could someone help me out? Many thanks! Regards, Hao Lee