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# That was my hard drive with my linux install Possible files are: lost+found var etc media. Grub> root (hd0,1) # first harddrive, second partition Grub> find / # type the slash then press, and it will try to list files on this partitionĮrror 17: Cannot mount selected partition # Oops no file system here You can go through your devices like in this example: grub> root (hd0,0) # first harddrive, first partition Now search for your USB drive, using the root command to choose a drive/partition and the find command to see if you found the right one. At the GRUB menu, hit the C key to enter command mode. To check if your BIOS is able to detect the USB drive and hand it over to GRUB, just run GRUB from your hard drive if it already installed, or from a GRUB boot floppy or CD. The easiest way to boot from a USB Drive is to boot via GRUB. In this case the GRUB bootloader can do the job directly, without the need of an initial Linux system. Note: If the computer was made between 20, it may contain USB drivers, but not an option to boot from USB. A minimal Linux system contains the necessary USB drivers to continue the boot process. They may not recognize USB drives initially, and may require operating system drivers to accomplish this.Īn alternative for older machines is to let the BIOS start a minimal Linux system on a BIOS supported drive such as a floppy disk, CD, or HD, and then transfer control to the USB drive to continue booting the full operating system.They may lack a BIOS setting to allow booting from USB.A modern BIOS (written after 2002) usually contains USB drivers and a boot from USB option but older computers often don't have these features. PCs use a system called the BIOS (Basic Input/Output System) to start the machine.