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Old Aug 14, 2005, 6:13 PM   #1
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I know this isn't theideal forum to post this questionto, except you guys are good and can answer it.

I have several .jpg and .tif files that got corrupted a while ago. I got paranoid and reformated the computer, F disked and everything. Suddenly I realize that it's happeneing again.

When I browse to the file Windows Explorer cannot preview it. If it's a jpg file Photoshop (7)says it "Could not open because an unknown or invalid JPEG marker type is found" and if it's a tif file it says it cannot open it because it's not a tif file.

If I try to open either of them in Paint it says "This is not a valid bitmap file, or is not currently supported".

When I try to view the Exif data (using EXIF Image Viewer)in the jpg files I get "Not a JPEG file. Starts with Oxbd Ox8d", although these numbers change slightly.

It certainly takes the joy out of photography.
Any help would sure be appreciated.

Thanks
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Old Aug 20, 2005, 10:14 AM   #2
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I take it these JPG and TIF files are coming from your camera? Have you checked your memory card for errors? You should format the memory card in the camera? This needs tobe done from time to time. The corruption could be a card related problem but it can also be a camera problem. You can usually eliminate it as a camera problem if you try a different card and the problem goes away. I've seen a good number of "bad" memory cards over the years and they do corrupt image files.
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Old Aug 20, 2005, 10:38 AM   #3
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Thanks for your time Steve.

Most are from my camera, but I have seen a few scans of oldphotos also have the problem.

I've reformated my cards due to paranoia of the problem you describe.

It must be a computer issue since the files seem fine at first, and only weeks or months later when I go to access them again do I find that they have become corrupted.

If anyone has any recommendations of a more appropriate forum to ask this please let me know. I realize this is a photograhy forum, not a computer forum.

Thanks again
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Old Aug 20, 2005, 4:35 PM   #4
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Have you run a complete virus scan with up to date definitions? Are image files the only files you have had problems with?
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Old Aug 20, 2005, 9:04 PM   #5
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Yes. I use Norton Antivirus and I keep my definitions up to date. I have also run one of those online virus checks for extra insurance. I run Microsoft's AntiSpyware also, and for a while I was running other spyware blockers as well.

As I mentioned in my initial post I even reformatted and f disked this computer because I was so freaked out by this problem. Now it's back. New files are being corrupted.

I am on a network, so I suppose any virus etc could reside on another machine. It also could be something wrong with some software I have and I reinstalled the problem when I reinstalled software. (just theories)

To your second question...To my knowledge the only affected files are images and only in jpg and tif format.

I have also tried PixRecovery on the files, but it's no help.
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Old Aug 20, 2005, 10:46 PM   #6
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I was thinking about it and the one thing all these files may have in common is that I've probably at least opened them in Photoshop 7.1 at some point.

I read some stuff online aboutsome kind of XMP corruption that was a problem with version 7, but the symptoms don't match my problem.

I searched on Adobe's forums, but found nothing.
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Old Aug 21, 2005, 4:36 AM   #7
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I think I would start with a complete disk diagnostic, and if that checks OK. do a thorough test of your memory (actually, your computer's memory :-)). If you are able to save and reopen a picture in a single session, the problem seems more related to data corruption due to memory error.

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Old Sep 11, 2005, 11:28 AM   #8
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zoi am having the exact same problem. as MR.Garlic describes on my Mac. The files become corrupted in time. I suspect its my Western Digital external back up hard drive but I have not had the problem with my jpgs yet downloaded and stored from my Canon Digital Rebel.



I am wondering if perhaps the psd. files become corrupted in my image browser canon software, when they attempt to open the stored psd or tiff files, as I seem only to be having this problem with those files. Not all my psd files are yet corrupted, I am busy moving them to another hard drive.



Any ideas. Have you solved this problem?



Thanks for any input.
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Old Sep 29, 2005, 10:38 AM   #9
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Guys I specialise in memory card recovery - the most common reason for a card becoming corrupt is because the user pulls the card out too quickly from the memory card reader and because most modern computers allow write behind cache then part of the card never fully gets written to.

The second most common reason is the batteries in the cameraand for the similar reason that it never fully writes all the data before the power fails.

Here are some simple steps to stop this:

1) Use lots of smaller cards. That way you only lose some of the data if the worst case scenario happens.

2) When using a computer make sure that the "safely remove hardware" is used. I'm not sure what it would be on the Mac but I cannot imagine a PC would have something a Mac does not!

3) Back up your cards to CD at the earliest opportunity - don't wait till you get home from a hoilday and risk losing the lot. Do it straight away and make sure you can read the disk. That way your data will always be safe and if your card does stop working abroad just buy a new one!

Another option could be to email the images in internet cafes - most mail boxes are rather large and can easily handle lots of images providing you have the time.


Hope this helps


Alan


http://www.canvasprintmaker.co.uk

Last edited by Alan Robertson; Sep 9, 2010 at 4:00 AM. Reason: Photostore product no longer available
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Old Oct 25, 2005, 11:43 AM   #10
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Try this guy, he doesn't promise a cure but he helped me out once
www.gavinpalmer.co.uk/jpeg.htm

Klingon
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