how to fix grub error 21

So im gonna start this section with some problems that can be common and how to fix them

Basically GRUB is a multi bootloader that allows you to run multiple hard drives at once and helps load multiple operating systems off different hard drives, now an issue that can occur when removing a drive is grub wants to detect a drive that ISNT there.. so all you have to do when you get error 21 is

enter Standard CMOS Setup

set the Primary Master to:

Type = User, Mode = LBA

by scrolling through the options

then set the Primary Slave to:

Type = Auto, Mode = Auto

and problem solved

Keywords: fix grub error 21

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