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I have a really big problem.
I wanted to delete files from USB. I searched and have found a link did it on terminal something like

dd if=/dev/urandom of=/dev/sda1 bc = 4MG

and then my PC just frozen I shut it down. Now My PC can't turn on

Please help me

Mostafa Ahangarha
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Vusala Hasanli
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    sda usually is the drive where the OS is installed. And the command you used, dd has the nickname of "disk destroyer" for a reason: It doesn't ask for confirmation, it doesn't take prisoners. You system was wiped out with that single command. –  Feb 17 '17 at 11:16
  • So how can I fix it please help – Vusala Hasanli Feb 17 '17 at 11:19
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    You have to reinstall. –  Feb 17 '17 at 11:20
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    Before you reinstall, even before you do anything else with the internal drive, you should try to recover the important files. See this link with tips how to repair a file system and/or recover files even without a file system, http://ubuntuforums.org/showthread.php?t=2196858&p=13409986#post13409986 – sudodus Feb 17 '17 at 11:38
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    Never run any command just because it is written somewhere. Before running it, have a look in man page to see what is the command for. – Mostafa Ahangarha Feb 17 '17 at 12:05
  • You've accidentally wiped out your MBR, partitiion table and a little more, but much of your data should still be recoverable. I answered a similar question here – Elder Geek Feb 17 '17 at 13:21

1 Answers1

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There is a high probability that /dev/sda1 (/dev/sda being first hard disk) was your root partition and you have overwritten first 4MB of it with random data. You will have to reinstall Ubuntu on your system. before doing this. I recommend that you get an bootable USB with one of the Ubuntu Rescue distribution and try to salvage the data from the root partition. You will need an external hard disk drive to save the salvaged data.

Overview of the rescue linux OSs:

https://opensource.com/life/15/2/five-specialized-linux-distributions-computer-repair

NuMessiah
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