booting from external hard disk
Dear members, I have a pc that can not boot from usb. I want to buy an external hard disk which can be connetcted to a usb port. I want to install Etch, Sidux and Slackware on external hard disk. My question is how to boot from that hard disk. At present I have a usb pendrive. If I plug that into a usb port and load Grub then,Grub does not read usb disk. That is, it does not see my usbdisk as a harddisk. Does this mean Grub will be unable to see my external hard drive, if I buy one. Please guide me.