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#26 2012-02-21 15:41:59

hokasch
Member
Registered: 2007-09-23
Posts: 1,461

Re: First boot fails - Filesystem type unknown, partition type 0x7

Now to add another disk to the system.  Change drive order in BIOS so that arch disk is top of the boot order.

Fails to boot: Unable to find root device /dev/sda4!

So grub found the kernel on hd0,1, but the kernel can't find root.
It could be that grub sees arch disk first (from the BIOS boot order), but the kernel sees it in the "correct" order. You could check if thats true by editing the grub menu (press e) and try with "root=/dev/sdb4". Anyway, if you switch that line to UUID or label it should work even if you add more drives.

Actually not sure how to change the active partition to a linux one but come back to that later.  For the moment hd0,1 is the bootable partition.  This is the only drive in the system.

You can forget the bootable/active flag for Grub, it is not used at all. If you install grubs first stage to the MBR of the first drive (the "setup" command in the install), it gets picked up and refers to the stage 2 files (the "root" command of the install, i.e. your boot partition). These files include the menu.lst and the actual kernel is loaded from there (actually, there is also a stage1.5). Therefore, just changing the boot order in the Bios is enough.

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