Re: [bug #31777] After blanking start of disk, grub still shows secondary partitions

[Vladimir 'φ-coder/phcoder' Serbinenko]

On 11/26/2010 04:15 PM, Yann Dirson wrote:
> URL:
>   <http://savannah.gnu.org/bugs/?31777>
>
>                  Summary: After blanking start of disk, grub still shows
> secondary partitions
>                  Project: GNU GRUB
>             Submitted by: ydirson
>             Submitted on: Fri 26 Nov 2010 04:15:27 PM CET
>                 Category: Disk &amp; Partition
>                 Severity: Major
>                 Priority: 5 - Normal
>               Item Group: Software Error
>                   Status: None
>                  Privacy: Public
>              Assigned to: None
>          Originator Name: 
>         Originator Email: 
>              Open/Closed: Open
>          Discussion Lock: Any
>                  Release: 
>                  Release: Bazaar - trunk
>          Reproducibility: Every Time
>          Planned Release: None
>
>     _______________________________________________________
>
> Details:
>
> When the start of a disk is blanked to get rid of the
> partition table (with dd if=/dev/zero count=10), grub stops
> reporting the primary partitions, but still shows the secondary
> ones, starting at msdos5.
>
>
>   
When you erase the MBR, it removes the information about where to search
for start of logical chain. Since GRUB2 doesn't perform a disk scan for
lost chains there is no way it may find these partitions. So probably
for some obscure reason (e.g. drive in use by something that wrote the
entry back) logical entry wasn't erased
>
>     _______________________________________________________
>
> Reply to this item at:
>
>   <http://savannah.gnu.org/bugs/?31777>
>
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-- 
Regards
Vladimir 'φ-coder/phcoder' Serbinenko

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