Posted 16 June 2010 - 10:56 PM
A friend of mine has a computer used for image editing. After inserting a CF card into the computer's card reader, the raw image files (cr2 files) can be opened in adobe bridge/photoshop, but they sometimes appear corrupted. Sometimes one opens a picture to find that it is fine, but later when it is opened it is corrupted. Once it is "corrupted," even opening it in another program it still appears corrupted. This occurs even if you copy them to the HD and then open them, or just open them on the card. If they are opened in another program first, they usually appear ok, i guess i need to make sure that it isn't adobe that is corrupting them. However, if the computer is restarted, or if the card is inserted into another computer, the files appear ok again until they start becoming corrupt again. Also, the computer occasionally gives a blue screen of death error, saying irq not less or equal.
I have ran a couple passes of memtest86 to check the ram, and it appears fine, however I am having my friend run it all night tonight. I have not noticed any files besides image files becoming corrupted. The problem occurs with several different memory cards, so I don't think its a bad memory card, and I have also tried several different usb card readers in addition to the built in one.
I am not really sure what is causing the problem, whether it is software or hardware, so this might not be the right forum. To summarize what I have done to try to eliminate possibilities: Multiple card readers have been tried, multiple cards have been tried, a different computer has been used (which the images do work on), different image viewers have been tried. Other things to note: The problem is not constant, but it seems that continually opening the raw images eventually results in corrupting them. Also, I found this very interesting, if I copy all the images to the HD, and get one to be corrupted, if I then open it from the memory card it is also corrupted.
My definition of corrupt: the images end up with strange streaks of color across them, sometimes they are nearly unrecognizable. For example google image search for corrupt cr2 files, and look at the ones with weird streaks of color.
I'd be grateful for any advice, right now I am pretty lost.