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Old 09-10-2019, 02:40 AM   #1
hddfsck
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Corrupted files I need to "uncorrupt" without deleting the files themselves...?


I am reading online about how to do this, if possible, but any expert opinions would be appreciated very much.

The corrupted files are on a fat-formatted flash that i'm using on debian. The current files that I have found with corruption, though there may be more, come from documents that were 'scanned' and saved to the flash. I can see part of the document, but the other part of the same document looks like there is a 'dark, solid gray piece of paper covering the rest of the document; in most cases, most of the document is covered starting below the top of the document.

Any direction regarding this would likely be helpful!

Thanks.
 
Old 09-10-2019, 03:00 AM   #2
pan64
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in most cases corrupted means some data is missing (for example: part of the file is unreadable).
You cannot recover those, better to use a backup. From the other hand if they were documents, probably the software used to create those documents can help you to restore them.
 
Old 09-10-2019, 03:06 AM   #3
hddfsck
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Originally Posted by pan64 View Post
in most cases corrupted means some data is missing (for example: part of the file is unreadable).
You cannot recover those, better to use a backup. From the other hand if they were documents, probably the software used to create those documents can help you to restore them.
The corrupted files I just found are "scanned images" of docs.
Thanks.
 
Old 09-10-2019, 03:37 AM   #4
berndbausch
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Quote:
Originally Posted by hddfsck View Post
The corrupted files I just found are "scanned images" of docs.
Thanks.
Are you sure that these files were complete from the beginning?

In other words, were they scanned correctly?

My assumption is that the missing data (the grey part) is simply not there. From a system point of view, there is no corruption. The problem is at the scanner or the computer that received the scanned files.
 
Old 09-10-2019, 03:52 AM   #5
hddfsck
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Originally Posted by berndbausch View Post
Are you sure that these files were complete from the beginning?

In other words, were they scanned correctly?

My assumption is that the missing data (the grey part) is simply not there. From a system point of view, there is no corruption. The problem is at the scanner or the computer that received the scanned files.
Yes, they were scanned correctly; I did the scanning of many documents. The docs that weren't scanned correctly because there was nothing there for the scanner to read, just shows a large black box. With the grey area, you can see that it is not just a square block, but rather more like a piece of a square puzzle-piece. Thanks.
 
Old 09-10-2019, 06:50 AM   #6
hddfsck
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The corruption is "JPEG BISTREAM"

The corruption is "JPEG BISTREAM"
 
Old 09-10-2019, 06:50 AM   #7
hddfsck
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Originally Posted by berndbausch View Post
Are you sure that these files were complete from the beginning?

In other words, were they scanned correctly?

My assumption is that the missing data (the grey part) is simply not there. From a system point of view, there is no corruption. The problem is at the scanner or the computer that received the scanned files.
The corruption is "JPEG BISTREAM"
 
Old 09-10-2019, 06:54 AM   #8
pan64
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so do you want to improve the quality of those scanned images?
 
Old 09-10-2019, 08:51 AM   #9
hddfsck
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so do you want to improve the quality of those scanned images?
Yes, I want to see them in their original form or at least be able to read them as they are (images of) word docs. I see one tool online 'jpeg repair'. I am wondering if there is any CL that works; doubt it, but just asking.

Last edited by hddfsck; 09-10-2019 at 08:53 AM.
 
  


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