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Re: Cannot find core.img on a 3Tb GPT usb disk

From: lukshuntim
Subject: Re: Cannot find core.img on a 3Tb GPT usb disk
Date: Thu, 15 Aug 2013 01:19:40 +0800
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130803 Thunderbird/17.0.8

On Thursday, August 15, 2013 12:22 AM, Chris Murphy wrote:

On Aug 14, 2013, at 9:50 AM, address@hidden wrote:

Sector Sizes:     512 bytes logical, 4096 bytes physical

This indicates it's a 512e drive, but your original post said it had 4096 byte 
logical sectors.

The 512/4096 logical/physical is seen by smartmontools while the 4096/4096 is reported by GNU parted and I guess what the smartmontools reported is more accurate as it reads the drive directly. I think I just accept cgdisk's default when creating the partition for data and the partition alignment was 256 sectors. Maybe that's the reason why the ef02 BIOS boot partition subsequently created was only allowed to start at the rather large value of 1024KiB.

  Is it then possible to make BIOS recognise this disk to allow booting?

It should see it as a 512 byte sector drive, so yes if it really has 512 byte 
logical sectors.

Forgive me for these naive question: will changing the sector alignment to a smaller value (using gdisk) make it BIOS bootable? Will such change destroy the data on disk? That is, of course, assuming that the 512/4096 logical/physical information is correct.

Can gdisk be used to do the job? If yes, how?

Either gdisk or parted can be used to partition the drive correctly, using GPT 
partition scheme. However some BIOS have problems with GPT partitioned disks; 
and other BIOS have problems booting from USB.

My motherboard is Gigabyte GA-EP43-UD3L rev-1.0 with (Award) BIOS version F9, 
if that provides additional useful information.

Do you know for sure that this computer can boot from a USB drive? If not I'd test 
that first, and use MBR partition scheme to eliminate that as a variable. It's 
also possible it's the combination of USB and GPT that causes the problem, that 
the BIOS becomes confused with a > 2.2TB drive being reported. You might ask 
these questions to Gigabyte tech support and see if USB booting of a GPT 
partitioned 3TB drive is possible.

Yes, I've successfully booted usb devices so BIOS support for usb booting is definitely there. I'll try to find out whether the USB GPT combination is causing the problem from the vendor. It's not that easy, though. Maybe other reader on this list have some experience to share?


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