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Old 12-13-2010, 01:55 AM   #1
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Help me out with this "grub rescue" issue ?

I had Windows 7 and Ubuntu 10.1 installed in my intel i3 4gig DDR Sony Vaio E-series laptop. Both operating system were working fine. Only problem that I used to have was the sound didn't use to play when I boot through Ubuntu. Due to that, I formatted the corresponding drive from Windows in which there was Ubuntu installed. I used "diskmgmt.msc" to delete the partition and then format it. The format was successful and when I restarted my computer, this error was displayed:-

error: unknown filesystem
grub rescue >

Windows didn't load at all. I used to have multiple boot grub menu previously before formatting the partition but that didnt show up after formatting.

Help me out with this issue. I am unable to use any of the Operating System. thanx in advance !!
Old 12-13-2010, 09:20 AM   #2
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At the grub rescue prompt type:

grub rescue > chainloader (hd0)+1

Hit the Enter key and then do:

grub rescue > boot

Hit the Enter key again. That will generally work if windows is loaded on the first partition of the hard drive.

What happened is that when you installed ubuntu it overwrote the windows bootloader on the mbr with grub, the linux bootloader. The configuration file for grub was on the linux partition which you deleted so grub has no clue as to the location of your windows installation. Your windows installation is still there; you just need to restore the windows bootloader by overwriting grub which is currently installed on your mbr. To do that, you generally need a Windows installation cd/dvd which is not usually supplied with laptops anymore. If you can boot windows from the above method I gave you, I believe there are ways of restoring the windows bootloader from within Windows 7, but I'm not familiar with them. If you can get windows to boot, post back and I'll help you search for that method.

If you are fortunate enough to have a Windows 7 installation DVD, here are instructions on how to restore your windows bootloader using the installation dvd:
Old 12-13-2010, 08:14 PM   #3
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@kilgoretrout thanx for your answer. Actually I reinstalled ubuntu and it is working fine now. What I want to do now is uninstall Ubuntu?
Old 12-14-2010, 12:06 AM   #4
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Re: grub_rescue problem

What it sounds like what you are wanting to do here is restore the MBR so that Windows 7 will boot up as it did before you installed Ubuntu. This really is not so much an Ubuntu or for that matter Linux issue, but I will be kind. GRUB (Grand Universal Bootloader) gets installed on the Master Boot Record before the Windows bootloader which allows you to dual boot. By erasing/reformatting the filesystem you are essentially erasing the operating system, but by not repairing the MBR the remains of GRUB are still pointing to an operating system that has been erased hence the error you are receiving. So, if I am correct in assuming you would like to restore the MBR to how it was before you installed Ubuntu then what you will want to do is recover the boot record from Windows (use the chainloader grub option posted above or any available means to boot into Windows 7) and run the command bootsect /nt60 C:\ to recover the MBR on the C drive.


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