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I'm new to linux world. Just downloaded ubuntu and installed it alongside with windows 7 . In grub when I choose ubuntu, it opens with no problem, but when I try to open windows 7, this message appears:

A Disk Read Error Occured. Press CTRL+ALT+DEL to restart.

I googled for that problem which directed me to download a boot repair tool, when I choose : advanced options / retore MBR --> apply, then restart computer , It boot to win 7 without loading the grub menu.

then I opened the live ubuntu from a USB, launched the "boot repair" again, choose : recommended repair , then restart, It returns to the first problem , grub menu appear, from which I can choose only ubuntu , but win 7 show this msg again :

A Disk Read Error Occured. Press CTRL+ALT+DEL to restart.

I repeated more and more with the same results ...

What should I do?

I created a boot info summary using the "boot repair tool" if this can help , it's in this URL.

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follow [this answer][1] you would be lucky! [1]: – Amir Reza Adib Nov 14 '12 at 14:37

I had the same problem. It appears that either grub2, or the way Ubuntu implemented grub2, does not detect Windows partitions properly. I had a co-worker help me with this. First get grub working. Then I added the code below in /etc/grub.d/08_custom. Then update-grub. This puts Windows above Ubuntu so it will boot by default.

If you wish to boot Ubuntu by default, modify 40_custom instead. This will create a new entry for Windows along with the useless entry that was originally found. Select the custom entry to boot Windows. My new grub.cfg is at

Here is the contents of my 08_custom:

exec tail -n +3 $0
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
    menuentry 'Windows 7 (customized entry)' {
    insmod part_msdos
    insmod ntfs
    set root='(hd0,msdos1)'
    chainloader +1
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