Dual boot issue with external hard drive
I want to install RedHat 9 onto an external hard drive on my laptop. From what I've gathered from many people's warnings, if I try to use grub as my boot loader, I will always have to have my external hard drive connected to be able to boot, even if I wish to solely boot to my internal drive. This doesn't seem quite correct and I wanted to see if anyone had any info as to how to go about this.
Thanks in advance!