Re: Booting a USB hard drive
- From: Arno Schuring <aelschuring@xxxxxxxxxxx>
- Date: Tue, 10 May 2011 01:49:16 +0200
Peter Bonucci (peter.bonucci@xxxxxxxxxxx on 2011-05-09 13:21 -0700):
On Monday, May 09, 2011 10:25:44 am Camaleón wrote:Slightly offtopic, but I feel the urge to correct you here: the
On Mon, 09 May 2011 09:02:45 -0700, Peter Bonucci wrote:
On Sunday, May 08, 2011 10:17:47 pm Klaus Wolf wrote:
I think that this is not a debian related problem, The BIOS of
your Laptop has to bi figured to use the USB-Drive for boot.
The BIOS of this computer boots from all of my other USB drives.
The problem is this particular drive model (Western Digital My
Booting a USB drive when the drive and computer don't cooperate
is an old problem. People solved it under Debian years ago. I
just don't know how they solved it and search engines didn't help.
bootloader is for its disk I/O completely dependent on what the bios
provides. Therefore, if the bios does not provide int13 services for
USB disks (and older bioses didn't), there is nothing the bootloader
can do about it, except loading its own USB drivers.
Now that isn't the case here, because other disks boot fine. But it's
not a problem that's been "solved in Debian".
$ file -s /dev/sdXThere shouldn't be any mistery for this. If the BIOS is capable of
booting from a USB device but the drive where Debian has been
installed is bypassed by the BIOS, I would check that:
1/ GRUB is installed into the MBR of the USB disk.
I believe I did this while installing Debian on the USB drive. How
can I verify it?
where X is your usb drive. If GRUB2 is installed in the MBR, you should
see "x86 boot sector; GRand Unified Bootloader, stage1" or something
like that. Don't know if grub-legacy has a similar signature.
As an aside: this is hardly ever necessary. Grub does not use the2/ Partition where "/boot" is installed is marked with the bootable
flag (if there is no dedicated partition for "/boot", then "/"
should be the one to be marked).
active (bootable) flag for anything. The MS-DOS bootloader does use the
active flag, so you need it if grub is NOT installed in the mbr. And in
that case, the partition onto which grub is installed should be marked
:) not an external source. But you already indicated that other USB3/ The system can be properly booted from an external source (i.e.,
using a LiveCD of SuperGrubDisk).
The laptop boots from its own hard disk.
disks work fine.
Under SuperGrubDisk, "List devices/partitions", Grub doesn't see theHow do you boot SGB? From the internal drive, or another usb
USB drive. None of the other options boot the drive.
stick/netboot? Because if it's not via USB, it's not too surprising
that usb support is not loaded by the bios.
Selecting the experimental USB support doesn't seem to changelaptops are not known for their strict adherence to hardware standards,
so this isn't very surprising. Do you have a USB Legacy option in your
bios? It might help in this case (although it's primarily meant for
input devices, not disks)
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