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I'm having troubles accessing some files on an external disk giving me the following error:

ls: cannot access file.pdf: Input/output error

Some solutions suggested performing a disk check with fsck which I did.

Now when I mounted my disk again. I have found a new folder on its root found.000.

What is that folder? Is it safe to delete?

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The found.000 folder seems to be the output folder used by fsck in order to write the files it recover from the bad area on the disk.

It is possible that some corrupted data on your disk can be found there.

I'd suggest keeping this folder for a while.

I think that you can delete this folder when you'll be sure that no important data should be recover.

You can read more about it here :

Note that Unix system usually save such files in /lost+found (see this question)

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  • Thanks for the answer. I have accepted your answer because it actually answers my question. But I may ask one more. Is there a way to recover those "files" on Ubuntu ?
    – eliasah
    Mar 8, 2017 at 10:24
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    @eliasah - Thanks for accepting my answer. I don't know how to recover those "files" in Ubuntu. I've update my answer with a link about lost+found. Is it possible that this external drive has any connection to windows (NTFS , was connected to windows OS, etc)? usually found.000 reference to windows (hence the links in my answer).
    – Yaron
    Mar 8, 2017 at 10:28
  • Well this drive isn't in NTFS format and I do use it on Windows sometimes. It's a 1T disk and I had around 1.9GB in found.000. So I didn't want to be throwing eventually valuable data.
    – eliasah
    Mar 8, 2017 at 13:20
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    @eliasah - I want to help without causing any harm... if most of the HDD wasn't used before the fsck it is possible that the 1.9GB in the found.000 is just bad sectors of unused area of the HDD. I see two options for next steps: 1) check if any important file is missing 2) try to find a recovery utility
    – Yaron
    Mar 8, 2017 at 13:32
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    Thanks a lot for your help. I believe that this is what I will do !
    – eliasah
    Mar 8, 2017 at 13:42

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