GNU GRUB - Bugs: bug #34786, os-prober does not recognize...
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bug #34786: os-prober does not recognize Windows 7 partition
Submitter: | Pavel Mendl <pmendl> | ||
Submitted: | Wed 09 Nov 2011 03:04:48 PM UTC | ||
Category: | Booting | Severity: | Major |
Priority: | 5 - Normal | Item Group: | Software Error |
Status: | Invalid | Privacy: | Public |
Assigned to: | None | Originator Name: | |
Open/Closed: | Closed | Release: | other |
Release: | Reproducibility: | Every Time | |
Planned Release: | None |
Jump to the original submission
Mon 14 Nov 2011 11:48:52 AM UTC, comment #10: |
Pavel Mendl <pmendl> |
Sun 13 Nov 2011 11:06:41 PM UTC, comment #9: Windows installer always put its bootloader on the first bootable drive on active NTFS/FAT partition and creating one if none available. The only way to ensure that no modifications are done to unrelated drives is to disconnect them. As for moving the contents of this partition web search "installing bootmgr" |
Vladimir Serbinenko <phcoder> |
Sun 13 Nov 2011 10:56:50 PM UTC, comment #8: Success! I finally realized, that partition table is contained in the first (=MBR) sector of the device. Thus "mysterious" /dev/sdb3 was present when I used Windows 7 MBR (and eventually booted linux via USB stick) but disappeared when I restored GRUB2 MBR from the backup made before Windows 7 installation.
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Pavel Mendl <pmendl> |
Sat 12 Nov 2011 06:07:35 PM UTC, comment #7: No joy so far. I got partial success with the below listed grub menu item, what boots into Windows XP - but they are in the /dev/sda2, not /dev/sda3, what confuses me a bit. Maybe some trickery with partition hiding and bootable flag settings could help, however I am currently short of testing time.
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Pavel Mendl <pmendl> |
Sat 12 Nov 2011 08:59:03 AM UTC, comment #6: Crap. You are right! I did not notice /dev/sdb3 suddenly appeared (it was not formated before I started installation process). It must be kind of Windows installer magic. And it looks like this would be the proper Windows7 boot partition. In the following /dev/sdb3 is mounted as /mnt/Windows_XP not to need to create more and more folders under /mnt :
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Pavel Mendl <pmendl> |
Fri 11 Nov 2011 11:39:43 AM UTC, comment #5: sdb3 didn't appear in your original report. Is there a bootmgr and boot/bcd in the root there? I wonder why both os-prober and bootinfo both missed it. Does it appear among echo /sys/block/*/*[0-9] ? |
Vladimir Serbinenko <phcoder> |
Fri 11 Nov 2011 10:45:40 AM UTC, comment #4: Dear friend, thank you for your care and will to help.
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Pavel Mendl <pmendl> |
Thu 10 Nov 2011 10:14:26 PM UTC, comment #3: Your system doesn't seem to be EFI since you have no EFI system partition, so you need bootmgr somewhere. Are you able to find bootmgr on any partition (probably sda2 and sda3)? Can you send me the first sector of every disk and first sector of every partition? There is a slight possibility of one somewhat esoterical situation and I need those files to check it |
Vladimir Serbinenko <phcoder> |
Thu 10 Nov 2011 09:56:25 PM UTC, comment #2: Thanks for zour swift answer which displaz deep insight.
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Pavel Mendl <pmendl> |
Wed 09 Nov 2011 03:57:32 PM UTC, comment #1: We don't maintain os-prober. Moreover your bootinfo results clearly show the lack of bootmgr and associated files which leads me to believe that you windows install is incomplete and thus unbootable. |
Vladimir Serbinenko <phcoder> |
Wed 09 Nov 2011 03:04:48 PM UTC, original submission:
The issue is related to the GRUB2 from Debian, stating version 1.99-12.
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Pavel Mendl <pmendl> |
Depends on the following items: None found
Items that depend on this one: None found
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Follow 5 latest changes.
Date | Changed by | Updated Field | Previous Value | => | Replaced by |
---|---|---|---|---|---|
2011-11-11 | pmendl | Attached File | - | Added first_sectors.tar, #24348 | |
Attached File | - | Added bootmgr_locations.txt, #24349 | |||
Attached File | - | Added grub.cfg, #24350 | |||
2011-11-09 | phcoder | Status | None | Invalid | |
Open/Closed | Open | Closed |
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Corresponding source code
Thanks for your clues. Finally I have completely separated Windows and Linux HDDs and have clean and clear autoupdated GRUB2 menu and everything works like a charm. So it is proper time to say goodbye and close this thread.
Once again, thanks for all your kindly help and support. It saved me a lot of time and testing. Should there be something I could help you in future, feel free to e-mail me.
Take care,
Pavel