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How to restore my disk

From: Dennis Cao
Subject: How to restore my disk
Date: Sun, 3 Oct 2010 10:40:11 +0800

Yesterday, I used this command to correct my MBR on my working computer,
    $ dd if=/somefile of=/dev/sda  bs=512 count=1
But very unfortunately, I used a wrong file. Now when I boot my
working computer, it says:
   Non-system disk or disk error
   replace and strike any key when ready

I think the partition table is destroyed. How can I restore my disk?

曹贵林 ( Dennis Cao )

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