However, if you haven't configured Grub properly, you will encounter GRUB errors like those described below.įor Grub Stage 1, there are no error numbers, just 'Hard Disk Error', 'Floppy Error', 'Read Error', or 'Geom Error'. It's similar to NTLDR or BOOTMGR for Windows, but supports both Windows and Linux kernels, and comes with more features. GRUB stands for Grand Unified Bootloader, which is invoked by your system's BIOS to load kernels and display a boot menu for users to choose from. How to Recover Data from the Unbootable Computer Caused by GRUB Loading Errors