Delete / format and rescue...

Started Apr 5, 2012 | Discussions
photo2be
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Delete / format and rescue...
Apr 5, 2012

Hi all, here is the case..

Maybe I will be "forced" to delete some pics from a NEW Sandisc Extreme 16Gb card used with a Nikon D3s. As I know that will happen I plan to use the rescue program when back home. I will use JPG fine and max 50-60% of the card capacity, included the deleted pics. Ok, what I have NOT thought about and what can go wrong? My project is very important to me.

Best regars from Sweden,

Björn Bergman - Sweden
http://www.Photo2be.com

Nikon D3S
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Quoth
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If you shoot Raw and Jpeg
In reply to photo2be, Apr 5, 2012

and delete in camera, I seem to recall that one of the images is left undeleted.
Maybe someone can clarify that.

Why would you be forced to delete them in the first place though?

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photo2be
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Re: If you shoot Raw and Jpeg
In reply to Quoth, Apr 5, 2012

Hi, thanx for your response.. I will visit a country where they for sure doesn't like or even accept photographers.. Visit my homepage around april 25-30th of april and you will see.

Björn Bergman - Sweden
http://www.Photo2be.com

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hotdog321
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Re: Delete / format and rescue...
In reply to photo2be, Apr 5, 2012

One key point: be sure to test your erase/recovery procedure BEFORE you leave for your trip! Make sure everything works smoothly and you recover all your photographs and nothing is corrupted.

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photo2be
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Re: Delete / format and rescue...
In reply to hotdog321, Apr 5, 2012

Thanx! Looked into your homepage! Marvelouse pics! Great!!

Take a sneek into my homepage after april 25th approx. and you will se what's all about with the "rescue" project.. Hopefully...

Björn Bergman - Sweden
http://www.Photo2be.com

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kb2zuz
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Re: Delete / format and rescue...
In reply to photo2be, Apr 5, 2012

When you delete or format an image on your camera it doesn't delete the file. If you think of the card as a book and the images as chapters of the book, all it really does is erase the line in the table of contents that says Chapter 5 starts on page 87. The image is still there, it's just not labeled properly so the computer or camera can't find it. Similarly the quick format that you can perform in the camera, simply deletes the whole table of contents but leaves the files in place. Recovery programs go through the entire disk and say "hey this looks like a JPEG file" and then marks it as a JPG file and creates a new entry in the table of contents and puts new begin and end markers. Better programs also can recognize RAW files, but raw files can be pretty different, a 5D MK II and 5D Mk III have different RAW files (they're both .CR2, but they are somewhat different and a program that can recover Mk II files might not be able to recover Mk III files.) Shooting RAW + JPEG will give the program 2 files that it can recover for everyone, but RAW files take up a lot more space than JPG and will eat up more space on your card. Using dual cards in the 3Ds will also give a level of redundancy (if you can't recover an image on one card, the duplicate on the other care may still be recoverable)

Finally, keep in mind that when you delete a file (or quick format the card), while the actual data of the image is not deleted at the time, you're telling the card that it's alright to write new files in that space. So if a new image is shot on the card, it may overwrite a couple of the deleted files (because not all files are exactly the same size and because the camera will not always write them in the same place, it's possible for a new file to write over parts of multiple "deleted" files...) If part of "deleted" file is overwritten, you may not be able to recover it at all or you may recover a mess of pixels that only vaguely resembles a picture. So whatever you do, after you format/delete the files, don't shoot any more on that card until you recover the deleted files.

Worth noting. If the authorities that require you to delete your files have any technical competence, they would either confiscate/destroy your card or borrow it so they can do a hard wipe (where they erase everything on the card and replace them with random 0s and 1s so that no data can be recovered).
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~K

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hotdog321
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Re: Delete / format and rescue...
In reply to photo2be, Apr 5, 2012

Will do! And thanks for the kind words about my photos.

I can make some educated guesses where you may be traveling and have to erase photos from the card. Back in the old film days, we would sometimes have to reseal exposed rolls of film in the film boxes to make it look like they were unexposed.

The erase/recover procedure is easier--until the bad guys catch on. Good luck!

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photo2be
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Re: Delete / format and rescue...
In reply to hotdog321, Apr 5, 2012

I think your guess is quite good...We will keep in touch late april...

Björn Bergman - Sweden
http://www.Photo2be.com

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photo2be
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Re: Delete / format and rescue...
In reply to kb2zuz, Apr 5, 2012

Hi,

Thanx alot for your response. My "idea" is to fill the NEW card up to 50-60% INCLUSIVE the deleted pics.. will that reduce the risc that the deleted pic(s) will be overwritten? What will (probably) happen is that I more than one time will be asked to delete pics and I don't have a new card for every time that will occur..

Well at the moment nothing like what you say here will happen.. and they definetley will not buy it, they will CONFISCATE it.

"Worth noting. If the authorities that require you to delete your files have any technical competence, they would either confiscate/destroy your card or borrow it so they can do a hard wipe (where they erase everything on the card and replace them with random 0s and 1s so that no data can be recovered).

Welcome to visit my homepage after approx. April 25th and you will understand what was going on. Welcome.

Björn Bergman - Sweden
http://www.Photo2be.com

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willhall
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Re: Delete / format and rescue...
In reply to photo2be, Apr 6, 2012

As has been said, one youve formatted, as soon as you write to disk again, any of the images could be corrupted. As soon as you release the shutter after a format, dont count on getting any of the formatted images back. As others have said, you should probably do a dry run. Shoot some pictures, format, shoot some more and see what you can recover
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Bernard D
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Re: Delete / format and rescue...
In reply to photo2be, Apr 6, 2012

For recovering files, even after formating 5 times via my camera, while doing a demo of the application to my students, it has yet to fail me, very powerful, scary powerful!

PhotoRec - http://www.cgsecurity.org/wiki/PhotoRec

Enjoy!

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I measure my success in life not by my awards, but by the amount of smiles, hugs and kisses I get from my family on a daily basis !

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photo2be
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Re: Delete / format and rescue...
In reply to willhall, Apr 6, 2012

Thanx alot, will try!
Visit my homepage after April 25th and you will find out why I asked.

Björn Bergman - Sweden
http://www.Photo2be.com

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eNo
eNo
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Re: Delete / format and rescue...
In reply to photo2be, Apr 6, 2012

I hesitate to answer this question because I sense you are asking us for assistance in how to be dishonest or at least deceptive toward someone whose rules require that certain images be deleted?

At any rate, my one piece of advice is that you take no more photos after you delete, as new photos can over-write the locations where the deleted photos resided. As for what software to use, Google is your friend.
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photo2be
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Re: Delete / format and rescue...
In reply to eNo, Apr 6, 2012

Yes you are 100% right that "they" definitley don't want me to take pics they don't like. I you visit my homepage after approx. April 25th I hope you will like my pics and that I did the right thing. Anyhow thanx for your advice and response.

Björn Bergman - Sweden
http://www.Photo2be.com

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Robert J. Gonzalez
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Re: Delete / format and rescue...
In reply to hotdog321, Apr 8, 2012

hotdog321 wrote:
have someone nearby receiving your images via wi-fi.

One key point: be sure to test your erase/recovery procedure BEFORE you leave for your trip! Make sure everything works smoothly and you recover all your photographs and nothing is corrupted.

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photo2be
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Re: Delete / format and rescue...
In reply to Robert J. Gonzalez, Apr 8, 2012

Very, very good idéa, but probaly not ok where I am...
Björn Bergman - Sweden
http://www.Photo2be.com

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hesbehindyou
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In reply to Bernard D, Apr 8, 2012

Bernard D wrote:

For recovering files, even after formating 5 times via my camera, while doing a demo of the application to my students, it has yet to fail me, very powerful, scary powerful!

PhotoRec - http://www.cgsecurity.org/wiki/PhotoRec

+1. I tried several paid-for programs from well known companies but this was the only one that could recover video footage that was still playable. Very, very good.

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hesbehindyou
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Re: Delete / format and rescue...
In reply to photo2be, Apr 8, 2012

photo2be wrote:

My "idea" is to fill the NEW card up to 50-60% INCLUSIVE the deleted pics.. will that reduce the risc that the deleted pic(s) will be overwritten? What will (probably) happen is that I more than one time will be asked to delete pics and I don't have a new card for every time that will occur..

Poor idea, you almost certainly WILL lose pictures. Spend a modest amount of money on two or three cheap memory cards; you can get one for the same price as a beer.

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photo2be
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Re: Delete / format and rescue...
In reply to hesbehindyou, Apr 8, 2012

Hi, thanx for your response... The problem is that I probably can't have many cards in my pocket... they will search them if I am unlucky.. Visit my homepage after April 25th approx. and you wil find out why..

Björn Bergman - Sweden
http://www.Photo2be.com

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newsshooterjim
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Re: Delete / format and rescue...
In reply to photo2be, Apr 19, 2012

You only get one shot...it goes like this:
1-Format card-new table of contents is created
2-Take photo-image is stored on card, table of contents updates

3- Format card-images are still there, but you've torn the table of contents out of the book.

4-Take another photo-A new table of contents is created. Since the card is "clean" the system assumes that ALL data locations area available. It will, without a doubt, overwrite some (or all) of the original images.

Once you've formatted the card, you can not shoot on it again until after image recovery.

I know that my system seems to start in the same place each time. So, if I shoot a hundred photos, then format, then shoot fifty, the first fifty of my original shoot are going to be overwritten. Since I don't use a card to it's full capacity often, doing a full image recovery will result in dozens of images being recovered that may be months old...they were part of extensive shoots where I did use most of the card capacity, and they're still there.

I could probably recover the card that's in my camera now and get a hundred images from the last football game I shot, since that's the last thing I did that took a full card.

You can shoot this yourself. Write down sequential numbers, photograph them one at a time, format, rephotograph, see what's not there.

Jim Dean

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