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  #1  
Old 29th February 2012, 09:12 PM
lsatenstein Offline
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Location: Montreal, Quebec, Canada
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linuxiceweasel
Annaconda and the MBR

Why is it, with multiboot systems (multiple drives and partitions), there is a tendancy to overwrite the MBR based on some drive that is usually not the intended.

Why can the installers not backup the MBR to /boot, and include a small program to restore the good mbr due to a faulty choice.

Why?
I have a 2 drive system, I revised the bios to boot from B, and installed our favorite distribution. But due to bios order (IDE drives), it went and installed the grub mbr on A, which was my Windows system. Now I did not have the windows xp cd in front of me, so I landed in trouble. The bios had the rule boot from B, but the installer went ahead and installed on A. With IDE drives, I guess that my B drive was the slave.

Can we recommend a convenience update to annaconda and grub2 to backup the mbr prior to an overwrite?
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  #2  
Old 10th March 2012, 07:20 AM
schotty Online
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Posts: 206
windows_xp_2003ie
Re: Annaconda and the MBR

Good point. Never thought of that personally. Have you filed a bug report anywhere on that?
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  #3  
Old 11th March 2012, 05:16 AM
lsatenstein Offline
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linuxfirefox
Re: Annaconda and the MBR

Bugzilla change request submitted
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  #4  
Old 11th March 2012, 06:00 PM
Piscium Offline
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Join Date: Dec 2009
Location: Dublin,Ireland
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linuxfirefox
Re: Annaconda and the MBR

Quote:
Originally Posted by lsatenstein View Post
Why is it, with multiboot systems (multiple drives and partitions), there is a tendancy to overwrite the MBR based on some drive that is usually not the intended.

Why can the installers not backup the MBR to /boot, and include a small program to restore the good mbr due to a faulty choice.

Why?
I have a 2 drive system, I revised the bios to boot from B, and installed our favorite distribution. But due to bios order (IDE drives), it went and installed the grub mbr on A, which was my Windows system. Now I did not have the windows xp cd in front of me, so I landed in trouble. The bios had the rule boot from B, but the installer went ahead and installed on A. With IDE drives, I guess that my B drive was the slave.

Can we recommend a convenience update to annaconda and grub2 to backup the mbr prior to an overwrite?
The default is for Anaconda (and Ubuntu, Debian, SL and Mint installers, among others) to write Grub to drive A MBR, however Anaconda (like the other installers) allows you to choose where to store it.

You can store it at the beginning of a partition or at the beginning of another drive. Actually I never let Anaconda write the boot sector to its default place.
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  #5  
Old 13th March 2012, 02:18 AM
lsatenstein Offline
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Join Date: Jun 2005
Location: Montreal, Quebec, Canada
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linuxfirefox
Re: Annaconda and the MBR

Yes, but when you have 5 tasks to juggle, sometimes one clicks the mouse a few seconds before realization takes place. Then it is too late.

Also, there may be a desire at some time to install a new mbr on another drive, without doing a full installation. In this latter case, one would want to restore the mbr.
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