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USB 3.0 WD hard disk: boot problem

Hi!
After having installed Mageia KDE on a WD external USB 3.0 hd, I installed Fedora 15 and Mageia Gnome.
1. Booting from that hd - each second try - I got the error message "no boot sector on USB device" (50% success).
2. After the installation of LMDE (Mint Debian, Grub 1.9x) I added the last 3 lines

Code:

title Fedora 15 (hd0,7)

root (hd0,7)

configfile /boot/grub/menu.lst

title mageiaGnome (hd0,10)

root (hd0,10)

configfile /boot/grub/menu.lst

title LMDE (partition 9 WD)

root (hd0,8)

configfile /boot/grub/grub.cfg

to menu.lst of Mageia KDE (grub legacy), but I can't boot LMDE.
Error: "grub >"
Any ideas?
alfredo

I would install LMDE's grub2 to the MBR of the drive and let grub2's os-prober pick up the grub-legacy installs.

You can use this method from a LiveCD containing grub2:

https://help.ubuntu.com/community/Grub2#Copy LiveCD Files

Thanks! I made many installations installing a Linux with Grub1.9x into the MBR - no problem, but what I don't like: If you have multi boot you have to run - after a new kernel in one of the other Linux' e.g. -

Code:

sudo update-grub

Therefore I first installed a Linux with Grub legacy - and I found the solution:
Instead of

Quote:

configfile /boot/grub/grub.cfg

I have to add

Code:

chainloader +1

and it's okay.
But the important question is:
How to avoid the error message each second boot?
alfredo