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. It's similar to NTLDR or BOOTMGR for Windows, but support both Windows and Linux kernels, and comes with more features. However, if you haven't configured Grub properly, you will encounter GRUB errors like those described below.
For Grub Stage 1, there are no error numbers, just "Hard Disk Error", "Floppy Error", "Read Error", or "Geom Error". Hence, if you get an error number, you are probably using Grub Stage 1.5 or Stage 2.0. So, what does the Grub loading error number mean? Let's find out below:
Grub Loading Error 15: File not found. This error is displayed when the specified file name cannot be found.
Grub Loading Error 17: Cannot mount selected partition. This error is displayed when the partition requested exists, but the file system type is not be recognized by GRUB.
Grub Loading Error 21: Selected disk does not exist. This error is displayed if the disk is not recognized by the BIOS in the system.
Grub Loading Error 22: No such partition. This error is displayed if a requested partition isn't on the selected disk.
Here are some simple solutions for all popular Grub loading errors.
Grub Loading Error 15: Make sure the kernel exists. To find out what the exact kernel name is, boot from the Live CD, and mount /boot on your partition and then do the following: cd /boot | ls
Grub Loading Error 17: Make sure your root(x,y) settings are right in your Grub.conf. You could use a distribution CD or Live CD to set up Grub as shown below. (h0,0) means the first hard drive and the first partition on that drive.
Grub Loading Error 21: Make sure the disk is correctly connected and detected by the BIOS.
Grub Loading Error 22: You can use the Windows Installation Disc to run a Startup Repair and fix MBR.
The Grub loading error generally occurs when Grub is trying to load a non-Windows system. So you can fix the MBR with the Startup Repair option on the Windows Installation Disc and then re-install Grub. For Unix-like systems, use the distribution CD or Live CD.
When your computer encounters GRUB loading errors, you can't boot the computer if the above solutions fail. However, how can I recover data on the computer when this occurs? Don't worry. If this happens, you`ll need a powerful data recovery tool to make sure no important photos, videos, emails, or documents are lost because of the GRUB loading errors.
Recoverit Data Recovery can help you out on this issue. It can create bootable media for you to boot the unbootable computer and recover all kinds of data. Just follow the below steps:
1. After launching the Recoverit program, click on data recovery mode. If your windows 10 doesn't start, click the "Recover from Crash Computer" tab, then you will be prompted to click "Start" on the next window that pops up.
2. To create a booting drive, press the mode option. You will be presented with two booting options; the CD/DVD drive and the USB. You can choose any option among the two, then click on the "Create" button to commence the process.
3. You will be prompted with another pop-up window asking to format your selected mode. So if you chose the USB option, tap on the "Format" tab. However, ensure you have relevant data backed up before you continue.
4. The booting process will immediately. However, don't eject the USB flash drive during this process. The next action you need to take will display on the screen or you can view the entire guide.
5. The data recovery process would take a while, so ensure your laptop is plugged into a power source or ensure the battery is fully charged. Upon completion, three data recovery solution steps will be displayed on your screen.
6. Before starting the recovery process, ensure that you have permitted your computer boot sequence to boot from the boot media you created earlier. When that has been done, restart your computer and immediately punch the F12 key.
Note that your BIOS (Basic Input/Output System) key will differ from system to system. Check out how to set the computer to boot from a USB drive.
7. When booting is completed, Recoverit software will start automatically. Now you can copy your hard drive data or start a recovery process on your Windows 10 lost data. We can help you resolve issues regarding lost data on Windows 10.