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This is the command that I ran in a sudoed terminal: dd if=/dev/zero of=/dev/sd* bs=512 count=32

These are the sd* using lsblk:

sda      8:0    0 238.5G  0 disk   
├─sda1   8:1    0   600M  0 part /boot/efi  
├─sda2   8:2    0     3G  0 part   
├─sda3   8:3    0 227.2G  0 part /  
└─sda4   8:4    0   7.8G  0 part [SWAP]  
sdb      8:16   1  29.5G  0 disk   
└─sdb1   8:17   1  29.5G  0 part /media/adminn/STRONTIUM

I have not restarted the system yet. Is there a way I can recover the lost/corrupted data?

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    Edit question to show output of ls -l /dev/sd*? Commented May 4, 2020 at 12:41

1 Answer 1

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I have not restarted the system yet. Is there a way I can recover the lost/corrupted data?

I doubt that you have lost any data. It looks like you got lucky. Do ls -l /dev/sd* to see what you did. There should be a file there that you did not expect.

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  • OMG thx!! gorgeous file : ``` "-rw-r--r-- 1 root root 16384 May 4 16:30 '/dev/sd*'" and the rest brw-rw---- 1 root disk 8, 0 May 4 17:25 /dev/sda brw-rw---- 1 root disk 8, 1 May 4 17:25 /dev/sda1 brw-rw---- 1 root disk 8, 2 May 4 17:25 /dev/sda2 brw-rw---- 1 root disk 8, 3 May 4 17:25 /dev/sda3 brw-rw---- 1 root disk 8, 4 May 4 17:25 /dev/sda4 ``` How can i remove this sd* thing? If I had run of=/dev/sda instead, it would have had ruined the data right? how to recover in this case? Commented May 4, 2020 at 12:55
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    To delete it you need to quote: rm '/dev/sd*' so it does not expand the *. Practice before using sudo. Commented May 4, 2020 at 12:59
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    If it destroyed you data, then the recovery procedure is to re-install, and recover user-data from backup / remote-revision-control. Commented May 4, 2020 at 13:01
  • Worked beatifully! Thanks a lot for quick and correct reply. I hope you wouldn't mind if I ask you about what could we have done, if 16 bytes of data from all sda's were remove instead? Commented May 4, 2020 at 13:03
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    @Panki more precisely, it would be expanded, but it typically wouldn’t match anything (unless you happen to have an of= directory in the current directory, itself containing a dev directory, containing entries starting with sd), so the shell would either leave it as-is, remove entirely, or fail, depending on your glob settings. Commented May 4, 2020 at 13:19

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