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Stupid SD mistake


jaapv

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I popped my SD card with about 180 images on it into the PC Laptop of an acquaintance, stupidly forgetting to lock it... Off to Rescue pro, I fear. :(  

 

 

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OK, so that I can learn from your mistake, what actually happened to your images? Did the friend have the computer set to erase your SD card after downloading/viewing?

I want to know this too.  What happened exactly? Virus?  How would downloading the files affect the one's on the SD unless you used "cut+paste" instead of "copy+paste"?

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I have no idea what happened, we were only viewing the files from the card. But I do know the computer was able to write back to my card and corrupt it, it happened after I viewed it on the computer, unfortunately I did not download as well; I took one image after I found it could not be read by the camera (but it indicated the correct percentage on info) and that shot was recorded and displayed correctly.

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Although (fortunately) I have not had this experience myself, something similar happened to me (with non-photo data and software).  I speculate that the image viewing software wrote some temporary file to your SD card and that you removed the card without Mr. Gates' permission ("Safe to remove hardware").

However, I find it hard to believe that photo recovery software did not find anything.

 

Guy

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Although (fortunately) I have not had this experience myself, something similar happened to me (with non-photo data and software).  I speculate that the image viewing software wrote some temporary file to your SD card and that you removed the card without Mr. Gates' permission ("Safe to remove hardware").

However, I find it hard to believe that photo recovery software did not find anything.

 

Guy

No, I always eject the card safely... I'll keep looking, I think the bytes are still there, but that the headers are corrupt. The time stamps are all over the place too.

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Depending on the OS you are using, you should be able to make a backup of your SD card, as an image of the SD-card that is... so even you have more corruption on the SD-card, you have a backup you can work with.

Of course, and I will. I need to get to my MacPro. On the road right now.

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Not sure it helps, but I've had great success with Foremost (http://foremost.sourceforge.net/) under Linux for file recovery. You define what the file format looks like and the program walks over the drive to match the format. Examples are provided.

 

Put the suspect card in your pocket until you can find some dedicated time to focus on the recovery process.

 

Just compiled it with Xcode tools, so it should work under OS X too.

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Sorry Jaap to see what happened. :(

 

I can't remember if this tool is also valid for SD cards ,but you should have a look there:

 

https://www.grc.com/sr/spinrite.htm

 

Hope you can recover your work. If I am true: it seems to me that you recommanded to protect your SD card before introduising them into a computer...

Good luck.

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If you don't write protect the card, before physically removing it, you must always tell the OS to "unmount" the device (different OS have different ways of doing that). Unmounting the device will flush the write caches, commiting all changes to the card, and stop accessing it.

 

Now it is critical that you keep your card write-protected and run photorec and/or foremost as suggested by t00l1024. If you cannot rescue most of your files, then it usually means the card has a hardware problem.

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Usually if you're just accessing the files to read photos there won't be much data in the write cache.

This issue is very unusual. It could be a hardware fault with the card. Or a virus. Or perhaps FAT tables were being updated when the card was ejected and were corrupted. It should be possible to recove the files if it is no more than corruption of the FAT tables. There are plenty of file recovery tools out there. I've even been able to recover deleted files off an SD card that a security guard demanded I delete off the camera. ;)

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