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I replaced my old laptop drive which was win7 and ubuntu dual boot with an SSD.

Now I connected the old drive through a USB adapter and I want to boot from it.

But this comes up:

unknown filesystem
grub rescue>

As i need the programs from old drive I have to boot from it time to time and I don't want to install those software on the new drive. It takes so time to exchange the drives so I want to boot from USB.

how can I fix this?

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You could virtualize it when you need it so that you can save time on reboots and such. VirtualBox has has support for booting from physical hardware for quite a while, as has QEMU. See this SF question. – new123456 Oct 23 '11 at 15:49
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migrated from stackoverflow.com Oct 22 '11 at 23:14

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1 Answer

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1st you can try to :

grub rescue> ls
(hd0) (hd0,1)
grub rescue> insmod ext2
grub rescue> insmod msdos
error: unknown filesystem.

then you have to investigate

http://www.gnu.org/software/grub/manual/multiboot/multiboot.html

-- http://rzr.online.fr/q/grub

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