Loading USB External Devices in grub2

MikeyCarter · 01-02-2015, 12:14 AM

So if I add the:

insmod ehci
insmod usbms

I can start to see the external USB drive... however I lose the (hd0) thus stopping grub2 from working as it can't access the drive where all the grub files are.

So how do I get around this? Want to load both.

veerain · 01-02-2015, 12:24 AM

As far as I know you have to boot from USB Drive to access both USB and any HDD.

MikeyCarter · 01-02-2015, 01:12 AM

Quote:

Originally Posted by veerain

As far as I know you have to boot from USB Drive to access both USB and any HDD.

It's possible. Managed to get it by accident and think I may have found it.

If I run nativedisk it loads both the usb and internal HD. Thing is, seems it's needed in the custom.cfg file as it takes time for the USB drives to detect.

Also if you do a blind search (eg ls) it hangs grub2 looking for something on my drive.

Not perfect but doing the trick so far.

jefro · 01-02-2015, 06:05 PM

I would have thought grub didn't care but two things might affect it. As you say time to settle on usb and also how bios see's it. Not all bios's fully and correctly see it as it is.

I'd just put grub on both internal and usb and use F key at boot to select. That makes updates easier too.

MikeyCarter · 01-03-2015, 02:21 PM

Quote:

Originally Posted by jefro

I would have thought grub didn't care but two things might affect it. As you say time to settle on usb and also how bios see's it. Not all bios's fully and correctly see it as it is.

I'd just put grub on both internal and usb and use F key at boot to select. That makes updates easier too.

Grub is on both. But the USB one isn't working correctly since the HD was in the computer internal during install (want to leave it as is so I can boot correctly when/if the drive is swapped out of the USB cage).

Figured I'd get the internal one working with all OS's installed USB or not.

Windows 7 doesn't appear to work either way (something about not wanting to boot from USB drive) but being a linux forum not really a topic for here.