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Old 10-29-2013, 02:38 PM   #1
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Registered: Oct 2013
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"A disk read error occured" error for Win 7 boot after changing boot order in grub

Hi all,

I have installed Win7 first, then installed Ubuntu and that made Ubuntu the 1st choice on the boot order, but since I am natively a Windows user I tried to put Windows on 1st place via grub customizer, but after I pulled it on the 1st place, when I choose windows 7 on boot meny it gives me an error "A disk read error occured. Press Ctrl+Alt+Del to restart".

I did exactly like in this tutorial:

Help :S

After I have changed the boot order in grub, there is "on /dev/sda1" next to the "Windows 7" text in the boot menu. Before I changed boot order I am 99% sure there was only "Windows 7", without "on /dev/sda1". My guess is that the disk names in windows and linux are different so Windows can't find the path grub has writen for it where to boot from. But I am a total noob for linux and I don't know how to fix this!
Old 10-29-2013, 03:52 PM   #2
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Registered: Apr 2008
Distribution: Slackware, Ubuntu, PCLinux,
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since you apparently can still boot Ubuntu, do that and open a terminal and type the following: sudo fdisk -l(Lower Case Letter L in the command) and post the output here. The type cat /boot/grub/grub.cfg. This should open your grub.cfg file. Find the entry or entries for windows beginning with menuentry and post them here to get some help.

If you want to change the default boot entry in Grub, you only needed to replace one number with another which seems a lot simpler than using grub customizer, since it appears not to have worked?
Old 10-31-2013, 10:40 AM   #3
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Registered: Oct 2013
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Hi, thanks for reply, I have solved the problem by following this tutorial:
Haven't tried your solution, it's probably better but this got the job done too.


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